The Tri-Tronics Tracer Light is the first remotely activated dog collar light accessory. The Tracer Light will make it easier for you and others to see your dog at night. Choose between a blinking light or constant mode which is visible from up to 1/2 mile away. By using differing combinations of light color and mode you can identify multiple dogs. You can leave it on as long as required or switch it on only when needed. Shop Pet Store Unlimited for all pet supply needs. You save $10.00 instantly when you spend $100.00.