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
• Assembled Dimensions: 3.5" x 1.5" x 7.75"
• Color: Black
• Manufacturing Country: China