With 3 settings to choose from; fast flash, slow flash, or static light, these splash proof collars are perfect for dark nights with reflective detail as well as a band of LED light. Simply charge via the USB (Universal Serial Bus) port with cable provided to enjoy up to 6 hours illumination. The collars include a squeeze buckle system & strong D-ring to attach your dogs lead. 3 modes of illumination, 2 flash speeds & static Rechargeable via USB (Universal Serial Bus) cable (included) Will light for 6 hours in flash mode, 2.5 hours in static Visibility up to 500m Reflective stripes Splash water protected Polyester Size Guide S-M 30cm-40cm (red collar with red LED strip)M-L 40cm-50cm (green collar with green LED strip)L-XL 50cm-60cm (red collar with red LED strip) Width of collar 25mm