The collar sends light through an integrated optical fiber to create full-length illumination that lets you keep an eye on your dog in the moonlight. Featuring rechargeability, this collar lights up for more than six hours on a single charge, which means you don't need to worry about staying out a little after it falls dark - as long as you know your way back! 360° visibility Integrated optical fibre and two high-powered LEDs provide full-length illumination Glow or flash Easy push-button operation Water-resistant High-quality metal belt-buckle style closure for quick and easy adjustment Strong metal D-ring Recharges in approximately 1.25 hours using micro USB cable (not included) Run time: 6.5 hours Size fits a variety of dog breeds: 12"- 16" | 30.5cm - 40.6cm Size small dimensions: 18.11" x 1.50" x 0.79" | 460 mm X 38 mm X 20 mm