Evenly distribute heat in your hermit crabs habitat with the All Living Things Heating Mat. The heating mat can be used for plastic or glass habitats and is made of durable construction. A PetSmart exclusive. Features: For under tank mounting Includes: 1 Heating Mat Environment: Hermit Crab habitat Size: 4 in X 5 in (10.1 cm X 12.7 cm) Caution: For use on dry tanks only. For indoor household use only. To protect against electrical hazards, DO NOT immerse cords, plug or heater itself in water or any other liquid. Close supervision is necessary when using heater by or near children. DO NOT operate your heat mat if the cord or plug has been damaged in any way. DO NOT use the heat mat for anything other than its intended use. DO NOT use pins or other metallic objects to fasten the pad of the heater in place. DO NOT place on tanks with cracked or broken surfaces. Warning: This is an electrical product. Read all directions and instructions before operating. Failure to follow all directions and instructions properly may lead to electrical shock or fire which could cause bodily injury.