Add an unlimited number of pets to your YardMax In-Ground Fence™ System with this Extra Receiver Collar. The YardMax system maximises the amount of yard space for your pet to play freely in. When your pet nears the boundary, the collar will give a warning beep, followed by a static stimulation to remind your pet to stay within the boundaries. Your pet will be enjoying greater yard freedom in no time. Ergonomically-designed collar is smaller, lighter and more comfortable Exclusive ReadyTest® and PerfectFit tests ensure the Reciever Collar is ready and working Anti-Linger Prevention stops dog from lingering in the warning zone and draining battery Pass-through receiver allows you to use any length of collar strap that is non-metallic and 1.9 cm wide Over Stimulation Protection: Stimulation stops after 15 seconds Batteries: Uses rechargeable batteries Battery Charge Time: Battery recharges in 2-3 hours Battery Lasts: Each charge usually lasts 3 months Collar Size: Fits neck sizes 15 - 71 cm Compatible with YardMax In-Ground Fence™ system Waterproof System Includes Rechargeable Receiver Collar Receiver Collar Charger Operating Guide Short and Long Contact Points for short or long-haired pets Contact Point Wrench Test Light Tool