The Garmin Alpha TT 25 is a slim, rugged and universally sized collar designed to help you build a better dog, no matter the breed. It's sized to fit a wide range of dogs. Bright, multicolor LED beacon lights to help you identify and track your dog in low light. Collar fits both large and small breeds. Compatible with Garmin handhelds Alpha 10, 100, 200 & 200i; Astro 430; and Pro 550 Plus. User-replaceable Flex Band now features a more robust design. Allows for beacon light color adjustments. Faster, more secure pairing in congested areas where others are trying to pair. Dynamic update rate changes the track rate of the dog device based on the activity level and speed. Changeable LED lights for easier dog identification. Exceptionally rugged and durable design. WI-FI allows easy software updates. 18 levels of continuous or momentary stimulation plus audible tone and vibration. Shares the dog's name during pairing. LEDs come in yellow, magenta, cyan, white, green, red or blue. Track your dog up to 9 miles with a compatible handheld receiver, sold separately. Garmin Alpha TT25 Dog Collar Black/Orange