The SportDOG YardTrainer 105 Remote Trainer is designed for basic obedience training of your dog around the house or yard. The system offers eight levels of stimulation so you can easily customize the training of your dog. The collar receiver is waterproof, and the remote transmitter is water-resistant so you can train your dog rain or shine. Included lanyard allows hands-free convenience when walking through the woods or down the street. Maximum 100 yd. range. Includes four lithium batteries (two for the collar, two for the transmitter). Warranty: lifetime limited.