Thank you for viewing. This is an electric heater for pets, a 2016 model. The main body is approximately 21cm x 14.5cm, and the thickness is about 1.5cm. It was used for about 3 months for stag beetle larvae. I think it can also be used for small animals. There is no cover, box, or instruction manual. The brown side is strong, and the beige side is weak. There is no switch; it warms up when plugged in. Thank you.