---
product_id: 116132624
title: "KT-G3-A USA 4G GSM AUTO Relay Switch 12V Solenoid Remote Control Box Wireless Gate Opener 2CH Output HOG Trap Aircraft Pre-Heater System 30A Relay Contact(for AT&T and T-Mobile Volte 2022 New)"
brand: "kiaotime"
price: "S/.1017"
currency: PEN
in_stock: true
reviews_count: 8
category: "Kiao Time"
url: https://www.desertcart.pe/products/116132624-kt-g3-a-usa-4g-gsm-auto-relay-switch-12v
store_origin: PE
region: Peru
---

# Phone call & SMS remote control w/ feedback 4G LTE multi-band for USA carriers 30A high-power relay contact KT-G3-A USA 4G GSM AUTO Relay Switch 12V Solenoid Remote Control Box Wireless Gate Opener 2CH Output HOG Trap Aircraft Pre-Heater System 30A Relay Contact(for AT&T and T-Mobile Volte 2022 New)

**Brand:** kiaotime
**Price:** S/.1017
**Availability:** ✅ In Stock

## Summary

> 🚀 Unlock limitless remote power control—because your smart devices deserve smarter switches!

## Quick Answers

- **What is this?** KT-G3-A USA 4G GSM AUTO Relay Switch 12V Solenoid Remote Control Box Wireless Gate Opener 2CH Output HOG Trap Aircraft Pre-Heater System 30A Relay Contact(for AT&T and T-Mobile Volte 2022 New) by kiaotime
- **How much does it cost?** S/.1017 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/116132624-kt-g3-a-usa-4g-gsm-auto-relay-switch-12v)

## Best For

- kiaotime enthusiasts

## Why This Product

- Trusted kiaotime brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Instant SMS Confirmation:** Receive real-time SMS feedback confirming your commands were executed, eliminating guesswork.
- • **Unmatched 4G Connectivity:** Seamlessly works with AT&T & T-Mobile 4G/3G networks for truly global remote control within the USA.
- • **Zero-Minute Phone Control:** Activate relays via phone call without using minutes—caller ID recognition triggers instant on/off commands.
- • **Powerhouse Relay Performance:** Dual 30A relay switches handle heavy-duty devices like gates, hog traps, and aircraft heaters with ease.
- • **Flexible Multi-Platform Setup:** Program via Android app, SMS, Windows PC, or optional WiFi hotspot for ultimate control convenience.

## Overview

The KT-G3-A USA 4G GSM Auto Relay Switch is a robust 12V dual-channel relay controller designed for remote operation over AT&T and T-Mobile 4G/3G networks. Featuring 30A high-current relay contacts, it supports applications from automatic gate openers to aircraft engine pre-heaters. Control is achieved via phone calls or SMS without consuming call minutes, with instant SMS feedback for command confirmation. Multi-programming options include Android app, SMS, PC software, and optional WiFi access, making it a versatile and powerful solution for professional-grade remote device management.

## Description

KT-G3 Upgrade Features on the basis of KT-G21> Upgrade to 30A high power relay contact2> Use big relay connection screws for easy wiring3> WiFi and RF433Mhz features are optional to save relay working powerDescription4G Relay Switch works on the basis of 4G/3G network, so it requires a prepaid pay-as-you-go 4G SIM card from your cellular provider, No minutes are used as it doesn't actually answer the calls - it recognize caller ID and then reject your phone call to turn on the switch automatically.Its working way as same as your home wall mount manual press lights switch, the only difference is we changed manual press working way to Cell Phone wireless remote control. So the range of this relay switch is truly unlimited, You can remote control your home appliances anytime anywhere in the world!Applications:HOG TRAP systemAircraft engine heaterHome or office lighting controlGSM gate openerSpecification:Working Voltage: DC 12-24V@1-2AMaterial: ABSOutput: 2 channel relay, NO/NC,COMRelay Contact: 30A 250VAC/30VDCPower Consumption: Standby status:60mA@12V, Working status:100mA@12VMemory: Relay memory after AC power outageControl way: Phone Call/SMS/Timer control/Ralated working Working Humidity: >65%Working Temperature: -25 - +55℃WiFi LAN hotspot access: OptionalRadio Frequency: 433.92MHZ (for wireless keyfob,optional)Relay device dimension:7"(L) x 4.75"(W) x 2.25"(H)Package Dimension:8.75"(L) x 6.5"(W) x 2.75"(H)4G Module Bands: FDD-LTE:B2/ B4/ B12, 3G-WCDMA:B2/B4/B5 Compatible providers: USA: AT&T, T-MobileIn the Box:1 x 2CH 4G GSM Relay Switch1 x USB to micro-USB cable1 x Internal antenna1 x External high gain antenna1 x 12V 1ADC power adapter1 x U-disk manual and software

Review: A bit DIY, but worth it - Not sure I’ve ever written a review on here, but was impressed with the money I saved and felt I needed to share. Just so you know, it’s not a plug and play device. It does take a little work, but a great value. I use this device for turning my sump oil heater on my airplane (RV-7A) on and off remotely. I have a 2G unit that will be defunct and needed to upgrade. That vendor (Sw_tchb_xc_ntr_l) has a 4G unit. I just didn’t want to pay what they were asking. The 4G unit the competitive vendor supplies is extremely similar, but came with the outlet tails and sim card activated and installed. Basically, completely setup when it’s at your door. If you have one of those units, they function completely fine. If you want to save $250, this is a great option with a little work. One note-this is a -A unit, AT&T and T-Mobile. The -V (if you can find one) is Verizon. I would buy this box again in a heartbeat. Here’s what you need to know: You will need to supply your own micro sim card. The new cards are nano, but they have adapters with them for micro. I got T-Mobile. You need to have a phone to activate the card as there is no real way to receive the text they send to the relay. I went to the T-mobile store and the sales guy put it in his phone to activate it. $10 for the card and I put $10 on the pay-as-you-go card. You will need to supply your own power inlet/outlet pigtails. I used the pigtails from my 2G unit. They had LEDs to show if they had power. I did like that. But, if you’re handy, not a big deal. I AM NOT AN ELECTRICIAN. PLEASE COMPLETE PER YOUR REQUIRED ELECTRICAL CODE. With that said, here's what I did. Commoned the ground wires into a bundle, insulated; commoned the neutrals into a bundle, insulated; and then put the hot 120V to the com on the first relay with a jumper to the second relay, and then connected the hot for the outlets (female) to the normally open spots. Now the quirks: You need the 12V transformer to operate the relays/cell network gadgets and the 120V input to run your load. The competitive box uses an on-board transformer so one power plug does it all. So, you need two plug ins. Easy with a power strip, but still, it’s two power sources. The transformer that came with mine was a straight in type. A 90° would be better. I doubled the wire over at the plug on the board and basically zip tied it back to itself (the plug) to limit the loop on top of the plug’s height. Left alone, I was afraid it would stress the connection on the board. I’d rather fail/replace the transformer. Maybe I shouldn’t care and it would be fine. AND there is no way for the cord to get out of the box if you use the 3 stress reliefs at the bottom of the box for power and 2 outlets. So, Dremeled a notch in the side of the box. Tied a knot (yes, people are probably cringing at that comment) to be the stress relief. Almost completely ditto for the external antenna. If you can get by with the internal antenna, use it. The hangar has horrible cell reception (metal box) and needs the external antenna. Not sure you need the computer to setup the box or not. I just want a simple on/off with text and confirmation. As I said above, it’s a little work, but I’d buy it again.
Review: Works with ATT - Just wanna say this thing works very good. The only issue I had was using the sim.card someone else mentioned. Speed talk , complete junk. Using this for a remote hog trap speed talk would usually say all lines are busy over and over. Calls wouldn't go through. I'm in a rural area where Verizon and att gets through 99 percent of the time but speed talk was a joke. Went and got a 10 dollar att sim card and activated on a prepaid 30 dollar a month plan. It cost more but it works. No more 10 min to boot after plug in. Also u need to plug this into your computer with the cable and open the program that comes on the thumb drive. Once you connect it you can see the EMIN number plain as day. This is how you set this up. It's very easy to do and using the att sim card was worth the extra money to have something reliable.

## Features

- USA MULTI-BANDS 4G MODULE enable relay switch device can work with AT&T, T-Mobile 4G and 3G network, NOT work in other countries
- 2 CHANNEL RELAY SWICHES with 30A HIGH RELAY CONTACT enable you to control feral hog trap system, auto gate, aircraft engine heater and lights etc. anytime anywhere in the world
- FREE CHARGE PHONE CALL No.1 relay can be remote controlled by phone call, no minutes are used as it doesn't actually answer the calls - it recognize caller ID and then reject your phone call to turn on/off the switch automatically
- SMS FEEDBACK CONFIRMATION relay device will send you sms feedback after phone call or sms remote control, so you will know that relay switch received your command and act correctly
- MULTI PROGRAMMING WAY Android APP software,SMS text programming way,Windows PC software via USB,WiFi LAN hotspot access on PC(WiFi module optional)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Q7PKW5Z |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #166,519 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #705 in Garage Door Keypads & Remotes |
| Brand | KiaoTime |
| Coil Resistance | 30 |
| Coil Voltage | 12 Volts |
| Color | KT-G3-A(AT&T,T-Mobile) |
| Connector Type | Screw |
| Contact Current Rating | 30 Amps |
| Contact Material | Silver |
| Contact Type | 2no 2nc |
| Current Rating | 30 Amps |
| Customer Reviews | 4.0 4.0 out of 5 stars (135) |
| Date First Available | March 30, 2019 |
| Finish | White |
| Included Components | power adapter,U-disk,external antenna |
| Installation Method | Wall-Mounted |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.33 pounds |
| Manufacturer | KiaoTime |
| Material | ABS |
| Maximum Switching Current | 30 Amps |
| Maximum Switching Voltage | 24 Volts |
| Measurement System | Imperial |
| Minimum Switching Voltage | 12 Volts (DC) |
| Mounting Type | Surface Mount |
| Operation Mode | Automatic |
| Part Number | KT-G3 |
| Power Source | DC |
| Product Dimensions | 7 x 4.75 x 2.25 inches |
| Switch Style | Toggle |
| Thickness | 2.25 Inches |
| UPC | 603149819177 |
| Voltage | 12 Volts |

## Product Details

- **Connector Type:** Screw
- **Contact Material:** Silver
- **Contact Type:** 2no 2nc
- **Current Rating:** 30 Amps
- **Mounting Type:** Surface Mount

## Images

![KT-G3-A USA 4G GSM AUTO Relay Switch 12V Solenoid Remote Control Box Wireless Gate Opener 2CH Output HOG Trap Aircraft Pre-Heater System 30A Relay Contact(for AT&T and T-Mobile Volte 2022 New) - Image 1](https://m.media-amazon.com/images/I/61gsz9+9XwL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: How many different phone number can this unit store and recognize?**
A: you can add 8 numbers (3 administrators and 5 general users) on app software, but on PC software, you can add much more 42 numbers so total 50 numbers. 

AMROAD Seller · July 8, 2019

**Q: At&t is requiring an imei number to register the sim card, what am i supposed to do**
A: Ariana - Can't speak to how AT&T handles their SIM card registration ... don't have a clue.

I chose to purchase a SIM card offered by PayGo Ultra Mobile (which uses Verizon's network). I placed the SIM card into a smartphone to get the SIM card registered with PayGo and a phone number established. After a phone number was assigned to the SIM card, the SiM card was instilled in the remote switch. Not positive, but I beleave I could have registered the SIM card and received a phone number by just calling the 800 number for PayGo's customer service department and providing them with the SIM card's serial number.

**Q: When will these be available again**
A: Check with Amazon

**Q: Will this work now that at&t has done away with 3g?**
A: yes, it works on ATT 4G VoLTE network from May 2011, NEW stock items.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A bit DIY, but worth it
*by C***S on October 6, 2019*

Not sure I’ve ever written a review on here, but was impressed with the money I saved and felt I needed to share. Just so you know, it’s not a plug and play device. It does take a little work, but a great value. I use this device for turning my sump oil heater on my airplane (RV-7A) on and off remotely. I have a 2G unit that will be defunct and needed to upgrade. That vendor (Sw_tchb_xc_ntr_l) has a 4G unit. I just didn’t want to pay what they were asking. The 4G unit the competitive vendor supplies is extremely similar, but came with the outlet tails and sim card activated and installed. Basically, completely setup when it’s at your door. If you have one of those units, they function completely fine. If you want to save $250, this is a great option with a little work. One note-this is a -A unit, AT&T and T-Mobile. The -V (if you can find one) is Verizon. I would buy this box again in a heartbeat. Here’s what you need to know: You will need to supply your own micro sim card. The new cards are nano, but they have adapters with them for micro. I got T-Mobile. You need to have a phone to activate the card as there is no real way to receive the text they send to the relay. I went to the T-mobile store and the sales guy put it in his phone to activate it. $10 for the card and I put $10 on the pay-as-you-go card. You will need to supply your own power inlet/outlet pigtails. I used the pigtails from my 2G unit. They had LEDs to show if they had power. I did like that. But, if you’re handy, not a big deal. I AM NOT AN ELECTRICIAN. PLEASE COMPLETE PER YOUR REQUIRED ELECTRICAL CODE. With that said, here's what I did. Commoned the ground wires into a bundle, insulated; commoned the neutrals into a bundle, insulated; and then put the hot 120V to the com on the first relay with a jumper to the second relay, and then connected the hot for the outlets (female) to the normally open spots. Now the quirks: You need the 12V transformer to operate the relays/cell network gadgets and the 120V input to run your load. The competitive box uses an on-board transformer so one power plug does it all. So, you need two plug ins. Easy with a power strip, but still, it’s two power sources. The transformer that came with mine was a straight in type. A 90° would be better. I doubled the wire over at the plug on the board and basically zip tied it back to itself (the plug) to limit the loop on top of the plug’s height. Left alone, I was afraid it would stress the connection on the board. I’d rather fail/replace the transformer. Maybe I shouldn’t care and it would be fine. AND there is no way for the cord to get out of the box if you use the 3 stress reliefs at the bottom of the box for power and 2 outlets. So, Dremeled a notch in the side of the box. Tied a knot (yes, people are probably cringing at that comment) to be the stress relief. Almost completely ditto for the external antenna. If you can get by with the internal antenna, use it. The hangar has horrible cell reception (metal box) and needs the external antenna. Not sure you need the computer to setup the box or not. I just want a simple on/off with text and confirmation. As I said above, it’s a little work, but I’d buy it again.

### ⭐⭐⭐⭐⭐ Works with ATT
*by C***Y on February 9, 2023*

Just wanna say this thing works very good. The only issue I had was using the sim.card someone else mentioned. Speed talk , complete junk. Using this for a remote hog trap speed talk would usually say all lines are busy over and over. Calls wouldn't go through. I'm in a rural area where Verizon and att gets through 99 percent of the time but speed talk was a joke. Went and got a 10 dollar att sim card and activated on a prepaid 30 dollar a month plan. It cost more but it works. No more 10 min to boot after plug in. Also u need to plug this into your computer with the cable and open the program that comes on the thumb drive. Once you connect it you can see the EMIN number plain as day. This is how you set this up. It's very easy to do and using the att sim card was worth the extra money to have something reliable.

### ⭐ This may no longer be supported by AT&T
*by C***S on June 22, 2022*

I purchased this unit in April 2021. I used an H2O pay as you go sim card (it uses the AT&T network). It worked well. In March 2022 I purchased another KT-G3-A. I purchased a new H2O pay as you go sim card. I can not get this unit to work with the New AT&T 4G network. Now neither KT-G3-A auto relay switch works. Looking at the reviews after Feb 2022 I can not find a single review where the switch works. Does this switch work???? If it does please provide support so we can get it working. If you are reading the reviews of this product that occurred prior to March of 2022 they are meaningless since AT&T have changed their network to the new 4G. Also, in an article on their web page the seller told us that the test they conducted in Texas was unsuccessful.

## Frequently Bought Together

- KT-G3-A USA 4G GSM AUTO Relay Switch 12V Solenoid Remote Control Box Wireless Gate Opener 2CH Output HOG Trap Aircraft Pre-Heater System 30A Relay Contact(for AT&T and T-Mobile Volte 2022 New)
- JDMSPEED 60 Pound Shaved Door Handle Trunk Solenoid Popper Kit Street Rod Design to Pop Open The Toughest Doors, Hoods and Trunks 60lb
- $5 Alarm SIM Card for GSM Home/Business Security Alarm System

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.pe/products/116132624-kt-g3-a-usa-4g-gsm-auto-relay-switch-12v](https://www.desertcart.pe/products/116132624-kt-g3-a-usa-4g-gsm-auto-relay-switch-12v)

---

*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-03-13*