hygger Small Submersible Aquarium Heater 100W Mini Betta Fish Tank Heater with LED Display Adjustable Temperature for 10-20 Gallon Freshwater Saltwater Coral Reef Tanks

Easy To Hide Compact Design -- Slim flat profile mini aquarium heater measures 4.3''x 1.8''x 0.9'', which is quiet space saving and easy to hide behind filter/wood/rock with two strong suction cups mount. 100W aquarium heater is suitable for 10-20 gallon freshwater/saltwater aquariums, turtle tanks, betta tanks and planted tanks

Convenient Digital Display -- LED digital readout is convenient and accurate, displaying real time water temperature and indicator light. It will be red when heating, green light when the proper temperature has been reached. Allows you monitor aquarium water temperature at any time

Adjustable Temperature & Memory Function-- Betta fish heater with external control allows you quick set temperature without getting hands wet especially in winter, adjustable wide temperature range of 59°F to 93°F in 1-degree increments. Memory function that remembers last setting, so you don't have to reset temperature after power failure

Safety Shut Off Protection -- small fish tank heater would automatically turn it off and flashing error code if the heater is not fully submerged, which ensure it doesn’t overheat and cause harm to your livestock. Shatterproof plastic guard protects fish/turtle from impact and making contact

Safe Rugged Construction -- Built in shatterproof quartz tube wrapped with two heating element mica plate and nickel wire, along with high-impact plastic housing, hygger fish tank heater ensures the safety of your pets while maintaining proper, constant temperature