The collar sends light through an integrated optical fibre to create full-length illumination that lets you keep an eye on your dog in the twilight.Take a torch with you too and you won\'t have to worry about walking a little into the evening - as long you have a light in hand!360° visibilityIntegrated optical fibre and two high-powered LEDs provide full-length illuminationGlow or flashEasy push-button operationWater-resistantHigh-quality metal belt-buckle style closure for quick and easy adjustmentStrong metal D-ringRecharges in approximately 1.25 hours using micro USB cable (not included)Run time: 6.5 hoursSizes fit a variety of dog breedsM: 16\"- 20\" / 40.6cm - 50.8cmDimensions:M: 22.13\" x 1.50\" x 0.79\" / 562 mm X 38 mm X 20 mmWeight:M: 3.53 oz / 100 g