Rechargeable. Water resistant. Impact resistant. Weight: .71oz. Easily slides over your dog's neck as a bright addition to their existing collar. 360 degrees of illumination. Disc-O Select technology features three selectable colors of red, green, and blue, or color-changing Disc-O mode. Disc-O mode features unique color-blending pattern. Cut-to-size customization from 9.5'' to 14.8''. Recharges using micro USB cable (not included). 4 hour runtime. Hang packaged.