The identical features as the three dog system (3 buttons on controller)but with the addition of a toggle switch to activate the 4th dog collar (white stripe). Four waterproof receivers, 1 mile range. Tone.
Green, Orange, Yellow solid color straps and orange with a white-stripe collar strap. All collar straps adjustable and with a square double buckle and metal keeper Three dual lead chargers included. 6 month warranty