EHEIM Jager heaters are fully submersible. With thermo-safetycontrol. Rigid special laboratory glass. Precise temperaturecontrol. Heating function is indicated by an on/off control lamp. Simple and safe recalibration. Extra long cable cord. Includessuction cup colder. Suitable for fresh and salt water. Preciselyregulated, constant water temperature is very important for thecomfort and success of your aquarium inhabitants. The JAfAfA, AgerTruTemp adjustable heater is an ultra-modern electronic thermaldevice offering today's best technology. Designed for use in bothfreshwater and saltwater aquarium, JAfAfA, Ager TruTemp fully-submersibleheaters include these great features: Shatterproof glass construction - Made with laboratory-gradeglass, TruTemp heaters are free of pollutants, resistant tochemical and biological substances, and able to withstand extremetemperature fluctuations. Their glass jackets also enlarge theheating surface and ensure even heat distribution. TruTemp Dial - Temperature can be precisely adjusted from 18AfA,A,Ato 34AfA,A,A C (65AfA,A,A to 93AfA,A,A F). Using the TruTemp dial withreadjustment ring, the user can recalibrate the heater for aprecise temperature reading. Control accuracy is +/- 0.5AfA,A,A C. Thermo Safety Control - This safety mechanism enables"running-dry" protection. The heater will shut off when removedfrom the water, and resume functioning upon return. On/Off Indicator Light - This convenient feature eliminatesguessing and enables the user to verify heater function withoutgetting their hands wet! Each JAfAfA, Ager TruTemp Heater also includes amounting bracket and suction cups for secure and flexible placementwithin your aquarium system. Extra Long Power Cord accomodates most applications. For aquariums up to 265 US Gallons. Available in 25 Watt to 300 Watt.