A Garmin Astro Bundle comes with a Garmin Astro 320 GPS handheld unit, and the T5 dog tracking collar with various accessories.
The system transmits your dog's exact location and also tells you if he's running, sitting, on point or treeing quarry. You can track up to 10 dogs by purchasing additional dog tracking collars for each dog.
The T5 is the latest tracking collar and adds GLONASS GPS functionality, LED Beacon lights, and Rescue Mode functionality over the preceding DC-50 collar. The TT-15 collar will also work with the Astro 320 however the additional features such as Multiple Stimulation Levels, Tone, Vibration, and VIRB Action Camera Control of the TT-15 will not work with the Astro system, only with the Alpha 100.