"• Fits and forms around collars up to 1"" wide (2.54cm)• Rechargeable Disc-O Select technology features three selectable colors of green, blue, and red plus red flash and color-changing Disc-O mode• Easily secures with micro hook + loop fasteners• Passive-reflective paw + bone pattern• Weather-resistant housing• Recharges in approximately 1.25 hours using micro USB cable (not included)• Run time: 7 hoursEvery dog has its day, and now, every dog has its nite with the rechargeable NiteDog LED Collar Cover by Nite Ize. Weather-resistant, durable, and low-profile, this flexible illuminated strip secures to most 1"" wide collars, leashes, and harnesses with two micro hook-and-loop tabs. Its bright light-transmitting polymer core is powered by rechargeable Disc-O Select Technologychoose from 3 selectable colors of green, blue, or red, plus red flash and color-changing Disc-O mode. Housed in a high-quality plastic exterior, the cover measures 6.42"" (163mm) long and features a passive-reflective paw + bone pattern for extra doggone fun. Recharging in 1.25 hours via micro USB cable (not included), NiteDog brightens up virtually any collar, leash, or harness to keep your pup seen, safe, and shining."