Ultra-bright bike turn signals: 39 high brightness LED bulbs, up to 100 lumens output, bright enough to be seen from 150 feet away on a foggy/rainy day or even in the dark night. IPX4 Waterproof: IPX4 waterproof level can be used in light to moderate rain in -20C to 60C - your best partner for outdoor cycling. Wireless remote control: Install a remote control on the front of the bike, easily control the bike taillight to send different signals with the three easy-to-use buttons on the wireless controller. Many possible uses: Suitable for all types of bikes: mountain bike, road bike, touring bike, racing bike, etc. Easy to control: right/left turn signals, emergency and warning light, for your safety in traffic. USB rechargeable: Built-in large capacity rechargeable battery, can work in flashing mode for up to 10 hours after fully charged, durable and eco-friendly. Can be adapted to a variety of charging methods, such as laptops, car chargers, mobile phone chargers, power banks, etc.