Premium Quality Aquarium Heater Available in a Range of Sizes to Suit Every Tank EHEIM are an extremely popular much loved brand due to the quality of manufacture. This range of aquarium heaters feature the following: Automatic shut off control (thermo-safety) enables protection from running dry - heater will shut off when out of water Rigid special laboratory glass, shatterproof Precise temperature control - dial at the top of the heater (68-90F or 20-32C) Heating function is indicated by an on/off control light Extra long cable of 1.7m (6'7") Includes clamp with 2 suction cups Made in Germany TIP: Heaters are designed to be fully upright in the tank next to a good water flow, so ensure you select not only the right size heater for your tank capacity but also one which will physically fit inside your tank.