Automatic OpeningNo need for complex splicing, built in frame, opened in seconds. Folds back flat when not in use for easy storing. Friendly Reminders!!!When the pet playpen is opened under spring pressure, it should be away from children and face. Outdoor/ IndoorThe Pet Exercise Fence is easy to carry, and you don't need to carry a huge cage when take your pet out. It can limit the range of pet activities (It may not be suitable for pets with jumping, climbing and biting habits). Size & MaterialWidth after expansion of 4 dimensions: 0.85m(2.79ft), 0.95m(3.1ft), 1.15m(3.77ft), 1.4m(4.59ft); Folding size: 31cm(12in); Polyester fabric, easy to clean Suitable ForSmall animals pet playpen, suitable for hamsters, chinchillas, guinea-pigs, gerbils, ferrets, squirrel, bunny, reptile or other small animals.