Key Features Robust and Slim design Perfect for submerged use Easy to view function check by an activated control light Easy to adjust 400 Watt The slim design heaters can be easily controlled to enable you to readjust the temperature precisely ( + / - 3°C) depending on the needs of your tank. The function of the heater can be easily detected by way of the activated control light at the front of the tube. The temperature levels can be controlled and monitored by the patened bi-metal technology runinng through the heater. Each heater can be easily submerged underwater and has an easy to use and install holder. Each HeatUp has a 1.5m power cable and comes with a 3 Year Guarantee The Heaters are suitable for Fresh and Salt Water Tanks