Track the pack with the Alpha T 20 dog collars. The new Alpha collar contains the same valued Garmin technology yet in a slim smaller housing no more bulk around the neck. When used with a compatible handheld (sold separately), Both collars will track up to 9 miles and the Alpha T20 has battery saving dynamic tracking, multicolor LED makes identifying your dog easy in darkness. Gets up to 68+ hours of battery life with the standard battery when using dynamic tracking