xcivi Paipaitek Rechargeable and Rainproof 550 yd Remote Dog Training Shock Collar with Beep, Vibration and Shock Electronic Electric Collar, New version Remote Dog Training Collar with Advanced RF 434Mhz Technology, boosts range up to 550 yards. Rechargeable and Water-resistant collar receiver and transmitter uickly synchronize the transmitter with collar receiver, within 10 seconds. Dog E-collar fits dogs. From 15 to 100 lbs with a nylon collar size from 14 to 23 inches long