USB charging method: Our bike tail light turn signal uses a built-in 500mah rechargeable battery, USB charging is convenient and fast, and it can work for about 5 hours under constant brightness. The LED bicycle light comes with a charging cable, which can be charged from any of your devices with USB ports, such as laptops, car chargers, mobile phone chargers, power banks, etcWaterproof bicycle taillight: The bike warning light is made of waterproof material to ensure safe use in rainy daysWireless remote control: Smart bicycle turn signal with turn signal is a wireless control system installed on the head of the bicycle. The functions of the taillights can be easily controlled via three easy-to-use buttons on the wireless controller to provide additional safety while ridingEasy to install: lightweight and durable bicycle taillights,bike turn light can be installed on all bicycles, childrens bicycles, and adult bicycles. It can also be used as helmet light, backpack light, warning light, etc.Set your own light mode:taillight with turning signal has 5 light mode options: turn right, turn left, red steady, red and blue flashing, all lights flashing. You can switch between different modes according to your needs and different occasions to get the best lighting experience and protect yourself