Size:CORISRX Thermostat & 500W Heater Product Features: 1. Powerful electronic quartz heaters for medium-size, large-size fish tanks with the maximum submersion depth of 1 meter (around 3.3 feet). 2. Two LED temperature Displays. One shows actual temperature of the aquarium and the other display shows scheduled temperature that has been set. Fast tracking tank temperature makes your life much easier and comfortable. 3. 40 inches long sensor cord. By placing both heater and sensor in a proper distance, the sensor can detect actual temperature more accurately and prevents auto shutoff before the aquarium tank is fully heated up. 4. A Wide voltage thermostat range: AC100V(1200 Watt)- 240V(2000 Watt). No needs to purchase a new heater thermostat if you are looking for getting a bigger tank for more tank members. Remiders for the best interest of users: 1. Fully immerse the heater in the aquarium water to make the heat spread more efficently and to avoid dry-burning that may decrease the product life. 2. Take some time watching your fish swimming at ease before you turn off the heater and take it out of the tank. Abrupt removal of heated quartz tube from cool water may lead to damage or cracks on the tube, vise versa. 3. After using the heater for a while, you may notice the quartz tube turning a bit brownish like vintage style. But it is total normal phenomenon and will not casue any danger to you and your pet aquatic. Included in The Package: 1. ISTA Aqurium Heaters*2 2. CORISRX Fish Tank Thermometer*1 3. Good Customer Service: Answer your question and help solve problems you have within 24 hours on buisness days
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