GROOVYPETS 1-Dog Remote Dog Training Collar Systems:Rechargeable Remote Dog Collar No Bark Training Shock Collar System Rechargeable remote and receiver, save big on batteries/Environment friendly; Shock levels: low level for sensitive dog while high level for stubborn dog; Strong humane vibration to train your dog or both dogs(if you get another collar). Adjustable strap fits 6-25"/15cm-65cm fits almost all dog neck size 600 feet range rechargeable remote has compact size(13cm in length) and lightweight(1.7oz/48g) design with lanyard and belt-clip for easy carrying