The SportDOG Yard Trainer has been proven safe, comfortable, and effective for dogs over 3.6 kg. Consistent, correct use of this product allows you to reinforce commands and correct misbehaviour from up to 100 metres. The Remote Transmitter sends a signal, activating the Collar Receiver to deliver a harmless stimulation. With proper training, a dog will learn to associate this signal with a command. This model features 8 adjustable static stimulation levels (plus a tone stimulation option) so you can tailor the stimulation level to your dogs temperament, eliminating risk of over-stimulation.