Product Specifications: Dimensions (W x H x D): 124 x 38 mm. Weight: 180 grams. Waterproof: IPX4. Power supply: DC 5 V, 1 A. Durability: Approximate operating time. Constant brightness for 4-5 hours. Scope of supply: 1 x Smart turn signal. 1 remote control. 2 x rubber seals. 1 x micro USB charging cable. 1 stand [How about USB charging] : My USB charging is convenient and fast, and it can work for about 5 hours under constant brightness. The LED bicycle light is equipped 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, etc. [Wireless remote control] : The smart bicycle taillight 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, thereby providing additional safety during riding. [IPX4 Waterproof Rating] : High-quality bicycle indicators can completely resist rain and wet weather, and are designed to provide waterproof functions for outdoor bicycles. The best outdoor cycling safety equipment can be given as a gift to your family and friends. [Why choose a combination of taillights and headlights] : Bicycle turn signals and matching headlights are very suitable for all kinds of bicycles: mountain bikes, road bikes, off-road vehicles, racing cars, etc. When riding at night, the headlights emit strong light to illuminate the road ahead, and the taillights with steering function can warn people behind. This bicycle light combination kit can greatly improve your safety factor when traveling at night.