For dogs 3.6 kg and up. Fits neck sizes 15 - 71 cm. For stubborn or hard-to-train dogs. 4 adjustable levels of static stimulation plus a tone/vibration only mode. Over Stimulation Protection. Covers up to 13 ares (1/3 acre/0.13 hectares) with included boundary wire. Expandable up to 400 ares/10 acres/4 hectares (additional wire and flags required). Add an unlimited number of pets.Waterproof Receiver Collar. Collar uses 1 x 9 Volt battery.Battery usually lasts 1-3 months. Good/low battery indicator.
