Pronetcus Submersible Aquarium Heater, 500W Adjustable Digital Display brand-new
1.user-friendly to use: Built-in digital display & a heating indicator light to indicate working status, key to adjust temp., adjustable range 70-94°F.Carbon fiber heating element: Compared with other types of heating elements, carbon fiber has a higher thermal energy conversion rate, saving energy & electricity. The carbon fiber heating tube is red when working, & the heating state is visible.Dry-burning protection: The aquarium heater needs to be completely immersed in water. If it is exposed to the air, the sensor will detect & stop heating, the blue LED indicator will go out, & when it is put back into the water, it will reset itself to resume work.Automatic constant temp. : The heater will automatically stop heating when heated to the set temp., & resume work when the temp. drops, so as to achieve constant temp. & the temp. accuracy is within 1°F difference.Suitable for fresh or salt water tank: Comes from a smoke-free home.New in box.