<b>Warm Tips:</b><br> Please read instruction and cautions of package box carefully before use.<br> Always keep heater rod and temperature probe fully submersible.<br> Before take out the heater, please disconnect power and wait for 10 MINUTES to cooling down.<br> <br> <b>Specification:<b> Voltage: 110V-120V, 60HZ<br> 300 Watt, for 40~60 Gallon fish tank, heater rod length: 10.24 inches<br>