The PetSafe Remote Transmitter Trainer Lanyard is a nylon lanyard allows you to keep your hands free while keeping your PetSafe remote trainer transmitter close by when you or your dog need it. The adjustable pet lanyard extends to 2 feet. You can use the trainer remote while attached to the lanyard, or quickly and easily unclip it from the plastic buckle. This lanyard is compatible with PetSafe remote trainer and lite remote trainer 100, 300, 600 and 900 yard models. The transmitter trainer lanyard comes with a manufacturer's warranty that is only valid when purchased from an authorized retailer. The PetSafe brand is here to help you and your pet live happy together.