Aqueon Preset Fish Tank Heater 100 watts Black 3.5" x 1.5" x 7.75"

The preset temperature has been calibrated to 78°, appropriate for most tropical fish. The fully submersible heaters are constructed of shatter-resistant quartz glass and features an automatic safety shut-off to avoid overheating. An LED indicator light displays red when actively heating. Features: Preset to 78°, accurate to +/- 1° No adjustment required Shatter resistant Auto shut-off LED light turns on when aquarium water is being heated