Trixie usb flash light collar blue helps keep your dog safe on dark winter evenings this collar has an approximate 500m visibility and glows brightly for up to 4 hours on the flashing light mode or for 25 hours on the static light mode this means your dog is clearly visible to you and other road users which helps to keep your pet safe on gloomy days once the led lights from the collar start to become dim the trixie usb flash light collar blue can be simply recharged via the handy usb