The Comet is all about convenient visibility. It features a bright LED light integrated into the strong buckle of a tough nylon collar with a heavy-duty O-ring, so it's as functional as it is practical. It redefines convenience by being stylish and comfortable, so it can be worn all day, every day and then switched on to be the best kind of safety device: one you can use at a moment's notice. Take your dog to the park and keep track of them for hundreds of feet away. Walk city streets with confidence knowing that motorists see you. Forewarn pedestrians that your pooch is silently bounding about. The Comet can even light your path in total darkness. Features a continuous and 2 flashing modes for any circumstance. Uses a common USB charger (included) and a 30 minute charge provides up to 6 hours of illumination.