D.T. Systems S.P.O.T. Night Sight LED Illumination Collar with Vibration function Led night sight illumination technology options (42 lumens total light output) Tough and durable nylon coated orange reflective collar that is adjustable from 8 to 22 in  increments and fits dogs from approx. 8-120 lbs 900 yard (1/2 mile) range with digital technology to maximize power Lightweight, compact, rechargeable and waterproof collar Weatherproof transmitter that operates off of 9v battery