Reptile Heat M size (approx. 30.5cm x 23cm). This is a self-temperature control panel heater that maintains a surface temperature of 45°C ± 5°C. Operation confirmed. Used for about 5 years. There is a feeling of use, but there are no problems with its use. No box or instruction manual. It will be protected from water and bending, packed in air cushion, and shipped.