This is the Pet Gear Auto Pet Carrier and Base and it works much like the infant seat that latches to a base in the car. Works great for smaller dogs and cats heading to the vet for their visit or when you are traveling.
Your pet is put in the carrier and then latched firmly to the base secured with the seat belt. You no longer have to worry about the pet running all over the car or escaping when you are getting out of the car. I have had to catch many a pet that leaped out of the car when they arrived at the clinic because they were not in a carrier or on a leash. I have also seen a couple of pets injured when the owners tried to close the door after putting the pet in the car, only to close the door on the pet. Your pet is also protected somewhat, in the event of an accident.