Aqueon Preset Heaters require no adjusting! 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.
Preset to 78°, accurate to +/- 1°
No adjustment required
Shatter resistant
Auto shut-off
LED light turns on when aquarium water is being heated
Disclaimer: Variations in room temperature may cause slight deviations in the actual water temperature