Garmin TT 15 Mini Dog Collar with LED Beacon Light, 4 Mile Range, Linear Stimulation Up to 18 Levels, Water-Resistant Rechargeable Li-ion A top-mounted, high-sensitivity GPS/GLONASS receiver, TT 15 mini dog device uses 18 levels of continuous and momentary stimulation. Rugged and water-resistant to 10 meters, this tracking and training dog device with collar is tough enough to run wherever your dog runs, up to 4 miles away. The stimulation features let you train each dog separately traditional stimulation allows you to make quick changes (low, medium or high) within a predetermined stimulation level (1-6), whereas linear stimulation allows progressively more stimulation from levels 1 to 18. You can remotely operate the LED beacon lights, built in to the dog device, to help locate your dog in low-light conditions. The TT 15 mini ships with a 3/4-inch red collar strap, 18.5" standard antenna, charging cable, AC adapter, vehicle power cable, and contact point set with wrench.