AquaClear Easy-Set Submersible Aquarium Heater features an easy-set temperature dial, waterproof seal, computer calibrated thermostat, and ceramic heater core for even heat distribution. The slim-line boron-silicate glass heater tube features heat resistant glass and longer glass tube for optimum heat transmission. Includes heater mounting brackets and bumper guard to prevent accidental damage. For 5-10 gallon fresh or saltwater aquariums. 13.3" long. UL® Listed for your safety. Shipping weight: 1 lb.