The PD 258-S Petrainer Bark Dog Collar Training System is a brand new shock collar designed for small, medium, and large dogs. This collar offers vibration, static/shock, and ultrasonic control methods, with adjustable shock levels for customized training. It is waterproof, allows for remote control operation, and is rechargeable for convenience. With the Petrainer brand reputation and advanced features, this collar is a reliable tool for obedience training your furry companion.