New in original unopened box Zoo Med Hermit Crab Heater 4 Watts - 7 x 4 x .25 inches A mini-size heater designed for all small hermit crab enclosures A 4-watt adhesive heater that is UL approved for plastic keeper-type cages Raises the ambient temperature in small terrariums by about five degrees The Zoo Med Hermit Crab Heater is a specialized mini-size heater designed for small hermit crab enclosures. It is a 4-watt adhesive heater that is UL approved for use in plastic keeper-type cages. The primary purpose of this heater is to raise the ambient temperature inside small terrariums by approximately five degrees Fahrenheit. Hermit crabs are ectothermic animals, which means they rely on external heat sources to regulate their body temperature. Maintaining the right temperature in their enclosure is essential for their health and well-being. This heater can provide a gentle and controlled heat source to create a suitable environment for hermit crabs. When using any heating equipment, it's crucial to monitor the temperature regularly to ensure it remains within the optimal range for hermit crabs. Too much heat can be harmful, so it's essential to follow the manufacturer's instructions and guidelines for the safe and effective use of the heater.