Welcome to AQQA <br> AQQA is a professional shop specializing in aquarium supplies and accessories,all products from this store the actual filming of goods please rest assured that you purchasers to buy! <br> We are determined to provide better product and better services to our customers.Our customer service is online 24 hours, providing pre-sale, sale, after-sale service, the product implements a free return policy, Free replacement within 3 months. If you have any questions, please feel free to contact us. <br> AQQA--Aquarium accessories,Quality Assurance <br><br> Product Description <br> Product Name:AQQA Aquarium Submersible Heater <br> Size:100W 200W 300W <br> Voltage:110V/60Hz <br> Cord length：4ft+5.9ft <br> Controller:External Controller（Not waterproof） <br> Temp Accuracy：±1℉ <br> Suggest fish tank size:25-35gallon 45-80gallon 80-95gallon <br> Package included:1×heater with external controller 1×user manual 2×suction cups <br><br> The main function of heater <br> 1.Automatic heating, intelligently stop heating when the set temperature is reached <br> 2.Dry burning-resistant protection, 5cm away from the water surface, automatic power off <br> 3.The current water temperature and the set temperature are displayed at the same time, without mutual interference, the current water temperature can be seen at any time <br> 4.Memory function, when the power is off, the previous settings will be maintained without resetting. If the heater have been in the fish tank, it will automatically start running after the power is turned on. Follow the previous settings <br><br> What The Lights Mean <br> 2.Red Light:The heater is heating <br> 1.Blue Light:Constant temperature,the water temperature is at the set temperature value <br> 3.Display shows"E1":Shut off automatically when the heater exposed to air,not fully submerged. <br><br> WARRANTY <br> 1-year free warranty. <br><br> If you have any questions, please contact us, wish shopping happy