Yellow rectangular heater, perfect for pets. - Color: Yellow - Shape: Rectangular - Power cord: Included Used item. My sister used this in her cockatiel's room, but she wasn't using it very effectively. It was not used inside a cage. Suitable for small animals that are sensitive to cold, such as hamsters, sugar gliders, and rabbits, rather than birds. It gives off a gentle warmth. I've cleaned it lightly, but please consider this only if you understand that it is a used item. I don't know the exact size, but I think it would be sufficient for a typical cage.