DT Systems SPT 2422 2-Dog Stimulation Collar The spt 2422, two dog model of the spt 2420, features momentary (nick) stimulation, continuous stimulation, jump stimulation (patent pending), rise stimulation (patent pending) and positive vibration Comes with two collar receiver units (orange and black) which are operated from the same transmitter. Lightweight, compact completely waterproof collars and transmitters with maxx-range internal collar antenna system One touch digital controls with lcd display on transmitter, 50 adjustable intensity levels displayed on the transmitter Rechargeable ni-mh battery system with built in safety shut-off reduces battery replacement costs Up to 2400 yard range Completely waterproof collar and transmitter Transmitter has an easy to read LCD screen Features positive vibration, jump and rise stimulation