The Garmin TT25 Mini Collar is a tracking collar set-up perfect for smaller dogs. It is compatible with Garmin dog tracking handheld devices Alpha 100, Alpha 200 and Alpha 300 to track and train your dog. The collar contains a zero length flex band that is universally sized with user-replaceable bands. It has 18 levels of continuous or momentary stimulation in the form of tone, vibration, and LED lights to help train your dog. The LED lights can be used to identify your dog even in the dark. The collar provides automatic updates when connected to Wi-Fi and has up to 68 hours of battery life. The Garmin TT25 Mini Collar allows you to track and send training commands up to a few miles with updates as frequent as 2.5 seconds.