THE Orlushy Digital Smart Aquarium Heater is a compact submersible 2 in 1 unit for smaller tanks. The Digital Smart Aquarium Heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks. The unit sticks to the side of your tank with 2 suckers and is small enough to not protrude into the compact tank. The front has a clear to see display that is easy to set. Simply use the click switch on the power cable to set the desired temperature of your water. Once it is set the Smart Heater will show the actual temperature of the water on the display. Then it will automatically heat the water to the set temperature. The sensitive and reliable thermostat at the core of the oval shaped unit will then maintain a constant water temperature.