<b>Multi-function LED digital display heater: Use advanced IC technology, perfect design,<br> Oval appearance, large LED display. Clearly and accurately displays the <br>water temperature, highlights your aquarium.</b><br><br> <b>Instructions</b> <br> ●Temperature control switch box should be higher than water surface.<br> ●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.<br> ●Heater should be completely submerged in the circulating water to work properly.<br> ●Heaters can not be exposed above the water, Heaters can not working.<br> <br> <b>Warning</b> <br> ●Please check whether this product uses a matching power grid voltage(110V/60Hz).<br> ●This product can not be repaired or modified by yourself, please ask supplier for suggestion.<br> ●Heater must be completely immersed in water, can not be exposed above water.<br> ●The heating rod is made of quartz glass assembly and cannot be easily damaged.<br> ●Turn off the power supply for 10 minutes before cleaning the tank or maintaining the heater.<br> ●When removing the heater, please don’t pull the power cord directly.<br> ●The power outlet to which the product is connected must have a leakage disconnect switch.<br> ●The power socket for heater must have a broken circuit switch. <br> <br> <b>Specification:</b><br> Power: 50Watt<br> Voltage: 110V-120V, 60HZ<br> Heater Size: 2.5 x 1.5 x3.5 inch