TT15 x is activated from the Alpha 100.  Is compatible with the Astro 320 for tracking only.

Rugged and water resistant up to 30 feet, this tracking and training dog dcevice is tough enough to run wherever you dog runs, up to 9 miles away.  The stimulation feature lets 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.

TT15 units when sold separately, ship with a 1 inch red collar strap. 

In the box will be TT15 dog device with rechargeable lithium-ion battery, 1 inch red collar strap, Charging clip, AC adapter, Vehicle power cable, Contact point set with wrench, and manual

Unit dimensions (WxHxD): 3.5" x 1.75" x 1.85"

Weight 7.3 ounces for transmitter and antenna, overall weight 10 ounces

Battery life: 24-48 hours, battery type: rechargeable lithium-ion pack, user replaceable

Interface: USB

Water rating: 30 feet

High-sensitivity GPS receiver, GPS antenna: top Black, Stimulation/Vibration/Tone

LED beacon lights

Rescue mode

Frequency mode: The T5 and TT15 are only comp0atible with the Astro 320 and the Alpha 100.  The T5 and TT15 can be configured for operation with either handheld but cannot be tracked simutaneously by both the Astro 320 and the Alpha 100.