Zoo Med's Ceramic Heat Emitter is now available in NANO size! Ceramic Heat Emitters are the perfect 24 hour heat source for all reptiles. These porcelain heating devices screw into a standard porcelain incandescent socket, giving off intense "muscle-penetrating" infrared heat. Additional Information: Emits No Light! 24-hour heat source for nano-sized terrariums Long life! Lasts up to 5 years. Ideal for small geckos, hatchling reptiles, amphibians, or invertebrates (arachnids or tarantulas). Available in 25 watt and 40 watt.