Welcome to a whole new world of nighttime visibility. Two ultra-bright LEDs send light through an integrated optical fiber to create full-length illumination so bright you need to see it to believe it. Featuring the convenience of rechargeability and easy push-button operation, this collar lights up for more than six hours on a single charge. Our optical fiber technology transmits light throughout the entire length of the collar without loss of light output and offers both constant glow and flash mode. The high-quality metal belt-buckle style closure is simple to adjust. This highly water-resistant collar is designed for ultimate durability and is available in a variety of sizes to fit large and small dogs. PRODUCT DETAILS 360Adeg visibility Integrated optical fiber 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 Sizes fit a variety of dog breeds S: 12"- 16" | 30.5cm - 40.6cm M: 16"- 20" | 40.6cm - 50.8cm L: 20" - 24" | 50.8cm - 61cm XL: 24" - 28" | 61cm - 71cm Dimensions: S: 18.11" x 1.50" x 0.79" | 460 mm X 38 mm X 20 mm M: 22.13" x 1.50" x 0.79" | 562 mm X 38 mm X 20 mm L: 26.14" x 1.50" x 0.79" | 664 mm X 38 mm X 20 mm XL: 30.16" x 1.50" x 0.79" | 766 mm X 38 mm X 20 mm Weight: S: 3.28 oz | 93 g M: 3.53 oz | 100 g L: 3.81 oz | 108 g XL: 4.06 oz | 115 g