For hobbyists who want superior heating with precision temperature control, the Stealth- Pro Shatterproof Heater is the ideal solution. FEATURES & BENEFITS Shatterproof injection- molded thermal plastic casing protects against wear and damage. Bi-color LEDs with Optic System illuminates Translucent Select Temp dial which glows red when heating, green when temp is OK. Mesh Heating Element with mica core, coupled with epoxy fill ensures the most efficient heat transfer and eliminates rattling coils and glass tubes. Safety shut-off, which shuts down the heater if it is removed from the water. The unit automatically restarts when it's returned to the water. Certified accuracy to +/-1 degree Fahrenheit.