USB rechargeable: these USB bicycle riding lights are made of quality aluminum alloy and plastic material, have built-in 650 mAh lithium battery, which is rechargeable via USB port, emitting bright light at night; Fully charged about 2 to 3 hours, the light can run for 4 to 14 hours Easy to install: these USB bike lights adopt universal design mount and make them fit for most different types of bikes, such as mountain bikes, road bikes, city bikes, kids bikes, etc., and the rear and front bicycle lights are easy to install, saving your time and effort With 4 light modes: these bicycle headlights and taillights come with 4 light modes including full brightness, half brightness, quick flashing and slow flashing, how long the battery lasts depends on the brightness, slow flashing mode can last about 10 hours and quick flashing mode will have a shorter endurance than the slow flashing one Wide range of applications: these USB rear and front bicycle lights can be widely applied for different kinds of bicycles, tandem bikes, trollers, scooters, cycling, hiking, camping, family activities and so on, nice for using in the dark, increasing safety when going outside at night Sufficient quantity: the package contains 4 pieces LED bike headlights in and 4 pieces LED bike taillights, each one is equipped with a rubber strap and a USB cable; There are 4 lights that emit white lights and 4 lights are red lights, you can choose the color of the light according to your need