Jager took their already superior heater and made it better. Jager All New TS Series heaters are completely waterproof, submersible heaters perfect for freshwater or saltwater use. Heavy duty 2mm thick shock resistant Pyrex glass construction are twice as thick as most other heaters and far stronger. The tempearture is adjustable from 64°F and 94°F with an easy to adjust thermostat. Precision bistable thermostat with an impressive +/- 0.5° accuracy. Free from radio and TV interference. 6 foot double insulated power cord included.All Jager aquarium heaters come with a 1 year warranty.