This extra Reciever Collar can be used to add another dog or as a replacement collar to the Stay and Play Wireless Fence Wireless Containment System. Smaller, lighter, more comfortable ergonomically designed collar. 5 levels of static correction plus tone-only mode for training. Recharges in 2-3 hours. Fits dogs 2.3 kg or more. Fits neck sizes 15.24cm - 58.42cm. Waterproof. 3 year warranty.