Up to 80 hours of battery life! Plus, with a compatible Garmin handheld device, sleep mode allows you to remotely put your device to sleep, extending battery life even further. This high-sensitivity GPS and GLONASS receiver tracks your dog up to 9 miles away and features a rugged, water-resistant design tough enough to run wherever your dog runs. LED beacon lights, activated from your compatible handheld, help keep track of your dog in the field. T5X is compatible with all existing Alpha®, PRO 550 Plus and Astro® 430 handheld devices from Garmin. You can easily update your device via Garmin Express™ software, available for both Mac® and Windows® devices.