he PetSafe PIF00-12917 2-Dog Stay and Play Wireless Dog Fence System is designed for yards up to 3/4 acres in size. This portable system features a water-resistant battery-operated collar receiver to offer secure, reliable containment. Patented run-through prevention and timeout between corrections help your dog learn his limits quickly and safely. The Stay and Play system consists of a Wireless fence transmitter with power adapter. When the dog approaches near the wireless perimeter, a special collar worn around his neck delivers a brief, totally harmless correction that discourages him from crossing the boundary. Corrections typically become less frequent as the dog learns his new limits. PetSafe PIF00-12917 2-Dog Stay and Play Wireless Dog Fence System Features: For dogs 5lbs and up 5 adjustable levels of correction Tone-only mode alerts your pet with a beep Rechargeable - 2 hours of charge provides about two weeks battery life Waterproof Cloth Collar Strap - Fits neck sizes 6-23 inches; weighs 3.1oz - Collar band can be replaced with your own collar strap PetSafe PIF00-12917 2-Dog Stay and Play Wireless Dog Fence System Safety Features: Low battery indicator; collar signals with flashing red light when needing recharging Correction stops after 15 seconds Independent Correction Levels PetSafe PIF00-12917 2-Dog Stay and Play Wireless Dog Fence System Contents: Wireless transmitter with power adapter,br> 2 Receiver collars with rechargeable battery Test light tool Operating and training guide (50) Boundary training flags Long contact points Contact point