<p>Electronic temperature control heater <br> <br> Feature:<br> 1.Technical innovation Easy operation<br> Precision IC inside,double-loop circuit design,Over-temperature protection, safety.Explosion-proof,auto-protection while heating air.High quality.Temperature control is accurate adjustable,Automatic temperature，Precise temperature control.<br> 2.Cooling recovery safety protection<br> The water temperature sensor is installed in the IC circuit to prevent air burning and heating over temperature. <br> 3.High quality,Explosion-proof Quartz tube<br> Aquarium heater tube is heat-resistant milky quartz made, excellent in explosion-proof, can be used in fresh water and salt water aquariums.<br> <br> How to use?<br> 1.Place the heating rod in a place where the water is fluid and fix the suction cup on the cylinder wall.<br> 2.Connect the power plug of the temperature controller.<br> 3.Adjust the control knob on the temperature controller to the desired temperature to complete the setting.<br> <br> Notices:Stick the heater horizontally onto the tank side near the water intake or on the way of water flow.Keep the aquarium heater fully submerged in water.<br> <br> Specifications:<br> Voltage:110 V Frequency: 50HZ<br> Led Indicator Light:When it working, the indicator light is red. <br> Temperature Range: 22℃-32℃ Temp exactness:±1<br> Maximum depth：Aquarium Heater Max deep water immersion 50CM<br> <br> Cutting off electricity after it's off water:<br> When the heater leaves the water surface and contacts the air, the built-in water temperature sensor will activate the protection device to automatically cut off the power supply. After the temperature drops, the normal heating function will be restored, and the safety is ensured.</p>