The Premier Pet Wireless Fence keeps your dog safely in your yard with a circular barrier that includes adjustable coverage up to 1/2 acre and is expandable for additional coverage area. This system can be set up in 1-2 hours and requires no wires or digging. The included waterproof receiver collar is adjustable up to 27", making it a great fit for both smaller and larger dogs. A low battery indicator on the collar will alert you when the collar battery (GAC11-16351) should be replaced. The collar has 1 level of tone only for training and 5 adjustable levels of static correction so that you are able to choose which level works best for your dog. A safety time-out feature will stop correcting after 30 seconds should your dog get outside of the boundary zone. The system is fully portable, making it ideal for your yard, camping, RVing or wherever life takes you! You also have the option of adding an unlimited number of dogs to the system with the Premier Pet Wireless Add-A-Dog collar (GIF00-16918). Give your dog freedom to play and yourself peace of mind with the Premier Pet Wireless Fence!