The rear flash is rechargeable via USB and can be used for about 18 hours after 2 hours of charging. The wireless remote can easily replace the CR2032 battery. The tail light of the bicycle has a 120 decibel horn to remind passers-by safely, and it is safer to ride at night. Right turn decibel speaker/Left turn decibel speaker/Red light steady/Red light flashing/All flashing. You can switch different modes according to your needs and occasions to get the best lighting experience and protect yourself. Remotely control the bike tail lights to send signals in different modes with 3 easy-to-use buttons on the wireless controller. Lightweight and durable bicycle tail light that can be mounted on all bicycles, children's bicycles and adult bicycles. It can also be used as a helmet light, backpack light, warning light, etc. The IPX4 waterproof rating makes this bike turn signal usable in light to moderate rain from -4 to 140F - your best partner for outdoor riding. Package Contents: 1 Bike Tail Light, 1 Remote Control, 1 USB Cable, 2 Rubber Bands and 1 Holder.