This is a heating device for reptiles, amphibians, small animals, and birds. It's a 24x24cm square, and one sheet is sufficient for small cages. I purchased it about 3 years ago at a pet shop (Kojima) for around 5000 yen. It's a PTC (self-temperature control) panel heater that maintains a stable temperature. You can adjust the temperature with the memory dial, and it automatically turns off when the set temperature is reached and turns on when it cools down. It's the type that is placed under the floor of the animal's enclosure, and it provided sufficient warmth at a fairly low temperature for my Djungarian hamster. Made in Japan, for peace of mind. 16W, AC100V. It works perfectly fine, but I'm selling it at a low price because it doesn't have any bags or packaging. - Voltage: AC100V - Output: 16W - Frequency: 50/60Hz Thank you for looking.