Signal light is a wireless control system which is mounted on the mountain bike turn signal head of the bicycle and can easily control the function of the taillight, thus providing additional safety when riding Humanized safety warning light LED buckle visual adjustment to prevent glare. Silicone strap taillight angle adjustable up and down The night bike taillights can be used as taillights (turn signals / steady) and turn signals (left turn lights). With three settings, the LED arrow lights up to indicate from left to right hazards such as car or motorcycle Resistant to rain and wet climates, this lightweight rear bike is designed for bicycles waterproof outdoors. Don't worry about rainy days This bike taillight can be charged via the USB ride taillight. The night light can work for a long time in flashing mode after 2 - 3 hours fully charged Size: tail light: 8.5*2.2*2.2cm, Controller: 5*4.5cm