The SportDOG SportHunter SD-1225 Trainer provides hunters and trainers with correction and communication versatility. The compact (3.1 oz) waterproof transmitter offers up to 16 stimulus levels, a choice of continuous or momentary stimulation and the ability to control a second or third collar. In addition, it provides you with the option to send tone or vibration signals to the collar receiver. The light weight (3.0 oz), waterproof collar receiver features a slim-profile and contoured shape that ensures custom fit on your dog's neck.