Garmin 0100104180 TT15 GPS Collar A Top-Mounted, High-Sensitivity GPS/GLONASS Receiver, TT 15 Dog Device uses 18 Levels Of Continuous And Momentary Stimulation, Plus Audible Tone And Vibration Activated From Alpha 100. Compatible With Astro 430 And 320 For tracking Only.Rugged And Water-Resistant To 10 meters, The tracking And Training Dog Device With Collar 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. You Can remotely Operate The Led Beacon Lights, Built In To The Dog Device, To Help Locate Your Dog In Low-Light conditions. TT 15 ships With a 1-Inch Red Collar Strap. Function: Dog Tracker/GPS Battery: Rechargeable Lithium Ion Proofs: Water Resistant Color: Red Compatible With: Dog Manufacturer: Garmin Mfg Number: 0100104180 Model: TT15 GPS Collar