Rechargeable Disc-O Select technology with three selectable colors of green, red, and blue, or color-changing mode. Disc-O mode features unique color blending pattern. Wide, light transmitting band lays flat on fluffy coats. Easily slides over your dog's neck as an addition to an existing collar. 360 degree illumination. Weather-resistant. Cut to fit from 12'' to 27'' (30.5cm-68.6cm). Recharges in approximately 2 hours with micro USB cable (not included). Run time: 10 hours. Hang packaged.