Uses a top-mounted high sensitivity GPS and Galileo receiver. Transmits location via VHF. Locates up to 9 miles away with 2.5 second updates using compatible handheld. Universally sized to fit large and small dog breeds. Tracking is based on movement to help extend battery life. Features multi-color LED beacon lights. Standard battery pack provides up to 68 hours of life. Automatic software updates when charging and connected to Wifi. Tracking handhelds NOT included. Waterproof up to 10 M. Includes: 1" Blue collar strap. Charging clip. USB-C cable.