Be confident in your purchase we're an Authorized Cobalt Aquatics Dealer. How cool is that?!?!? Features: Fully submersible heater Easy temperature setting Electronic Thermostat computer tested, accurate 0.7F Easy to read temperature scale Ceramic heat radiator Borosilicate glass for superior heat and shock resistance The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a 0.7F accuracy. An easy to set and read push-button thermostat and digital temperature display makes this highly advanced heater easy to use. Borosilicate glass tube construction provides superior heat and shock resistance and surrounds a high quality, solid ceramic heat radiator that provides the best even heat distribution. Perfect for freshwater and saltwater aquariums. SPECIAL NOTE for use with Aquarium Controllers: Please set temperatures higher than temperature of heater on all controllers. APEX users: Please be sure to plug your Neo-Glass into plug 4 or 8. Digital Aquatics users: Neo-Glass heaters can be plugged into any port without issue.