I live in cold climate, and every year I lose a few young due to the freezing weather. The Heated Nest Bowl is a great answer to raising young in colder weather. The bowls have a 6 foot heavy duty cord and are quite heavy. The bowl gets warm, not hot, and when plugged in, stay at a constant warm temperature. Heated Nest Bowls are available in two sizes, the 9 in. size is the standard size of most nest bowls and we also have available the 10 1/2 in. nest bowl, meant to be used for the larger breeds. If you have a few special pairs you would like to start breeding early, the bowl will help guarantee success. I would suggest the use of some sand at the bottom of the bowl, sand retains and distributes heat. You may also use whatever nesting material you normally use. Easy to clean, heavy and will not move. The bowls are just about unbreakable, made of a very heavy plastic. The bowls are a bit expensive but will last a lifetime. What is a very special pair of young worth? Power source: AC-120V 60 Hz Power consumption: 8W HEATED NEST BOWL 9 in.