The rear light is rechargeable via USB and provides up to 18 hours of runtime after a 2-hour charge. The wireless remote is replaceable with a CR2032 battery. The bicycle tail light features a 120-decibel horn to alert pedestrians and enhance safety during nighttime rides. Lighting modes include right turn signal, left turn signal, steady red light, flashing red light, and all lights flashing. Switch between modes easily to suit your riding conditions and preferences for optimal visibility and protection. Control the tail light remotely using the wireless controller with three simple buttons. This lightweight and durable bike light fits most bicycles, including children's and adult bikes, and can also be mounted on helmets, backpacks, or used as a warning light. With an IPX4 waterproof rating, it performs reliably in light to moderate rain and operates in temperatures from -4°F to 140°F, making it ideal for outdoor cycling. Package includes: 1 Bike Tail Light, 1 Remote Control, 1 USB Cable, 2 Rubber Bands, and 1 Holder.