Track your dogs position in almost any terrain with the Garmin T 5 Collar. Top-mounted GPS antenna improves performance via an integrated GLONASS positioning system that maintains location even in heavy tree cover or deep canyons. Compatible with either the Alpha 100 or the Astro 320 handheld devices (not included). Tracks up to nine miles away, sending precise locations every five seconds. LED beacon lights for low-light use are visible from up to 100 yards away. VIRB control can record video manually from the handheld device or automatically when the collar triggers an event. Rescue mode changes the update rate to every two minutes once power levels drop below 25%, extending battery life and giving you 12 hours to find a lost dog. Emergency Alert lets you send your location to other Alpha users within the area. Waterproof rating of 1ATM. Included rechargeable lithium-ion batteries power collar for up to 28 hours. Comes with replaceable 1 collar straps. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Tracking Systems.