This film heater with automatic temperature control provides a comfortable environment for hamsters. - Product Name: Film Heater - Size: Width 120 x Depth 170 x Height 10mm - Film Thickness: Approximately 1mm - Features: Automatic temperature control, PTC heater, Thermostat - Safety Design: Triple safety design It is used by placing it on the bottom of the cage exterior, but there are fine scratches on the surface from being taken in and out. Operation has been confirmed. Please consider purchasing if you understand that this is a used item.