FREESEA Aquarium Heater with LED Temperature Display (300Watt for 35 to 50 gal)

Multi-function LED digital display heater: Use advanced IC technology, perfect design, generous Oval appearance, large LED display. Clearly and accurately displays the water temperature, highlights your aquarium. Instructions ?Temperature control switch box should be higher than water surface. ?To get the best performance of heating up the aquarium , when you using this heater we suugest to use a wave maker at the same time to support water circulation. ?Heater should be completely submerged in the circulating water to work properly. ?Heaters can not be exposed above the water, Heaters can not working. Warning ?Please check whether this product uses a matching power grid voltage(110V/60Hz). ?This product can not be repaired or modified by yourself, please ask supplier for suggestion. ?Heater must be completely immersed in water, can not be exposed above water. ?The heating rod is made of quartz glass assembly and cannot be easily damaged. ?Turn off the power supply for 10 minutes before cleaning the tank or maintaining the heater. ?When removing the heater, please don't pull the power cord directly. ?The power outlet to which the product is connected must have a leakage disconnect switch. ?The power socket for heater must have a broken circuit switch. Specification: Power: 300Watt Voltage: 110V-120V, 60HZ Heater Size: 2.7 x 1.8 x4.7 inch