Garmin TT 15 Mini Dog DeviceThe TT 15 track and train dog device with collar is a top-mounted, high-sensitivity GPS/GLONASS receiver that uses 18 levels of continuous and momentary stimulation plus audible tone and vibration activated from the Alpha 100. Compatible with the Astro 320 for tracking only. Rugged and water resistant to 10 meters, this tracking and training dog device is tough enough to run wherever your dog runs, up to 9 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.TT 15 units, when sold separately, ship with a 1-inch red collar strap. Replacement straps are available in multiple colors (sold separately).Garmin USB Split Adapter CableDon't get stuck without either of your tracking or training devices while on the hunt. Our split adapter cable allows you to recharge your Alpha and TT 10 devices in your vehicle at the same time. Or, you can use it to charge 2 devices (Alpha 100 and/or TT 10) from a single cigarette lighter receptacle or single AC adapter.