Royal Wise Led Illumination Nylon Dog Collar with Buckle Night Safety Pet Collar The jewel light collar is visible up to 1,000 feet,keep your furbaby seen at night M: Length:14-17" adjustable, width:0.98" thickness: 0.2". Five jewel led lights,can adjust the size easily Also for pet like cats,deers etc, only two steps for replacing batteries.Long lasting 3V CR2025 batteies Easy to turn on and off(but a dog can't turn it on by rolling around) : First press-fast flasing ,second-stead on, then turn off. Jewel lights are securely inlay on collar and the Led lights colors match to collar Padded underneath, super soft & confortable material and premium nylon,strong metal buckle and D ring double layers nylon up to 0.2" thick,reflective stripes sewn into both side of the collar,in case the batteries die