Track your pack with the Alpha® T 20 dog collar. The rugged yet slim housing is designed to fit a range of breeds and features a user-replaceable flex band. When used with a compatible handheld (sold separately), this collar can track up to 9 miles. Plus, it includes a built-in multicolor LED that makes identifying your dog easy, even in darkness. Get up to 68 hours of battery life with the standard battery pack, or upgrade to the expanded battery pack to get up to 136 hours when using dynamic tracking - which optimizes update rates based on how your dog is moving. And when charging and connected to your network with Wi-Fi® technology, the collar will automatically install the latest software updates.