ULTRA-BRIGHT LED BIKE TAIL LIGHT- Smart bike tail light with turn signal has 31 of 160LM LED lights, bright enough to be seen from 150ft away in foggy/rainy day or even in dark night. SMART AUTO ON/OFF - No worry the taillight auto lights up when you sleep at night. On Slow Flashing & Breathing modes, tail light automatically turns off after 30 seconds of inactivity in dark environments, and turns on when motion is detected. In bright environments it automatically turns off to save power. If you need the tail light in day time, you can select Fast BlinkingSteady Light VIBRATION ALARM FUNCTION- Anti-theft bicycle alarm triggered by vibration, can help to deter thieves effectively, provide additional security and give you peace of mind when your vehicles park outdoors. 7 level adjustable sensitivity from gently touch to push or beat. BIKE HORN FUNCTION- With electric bike horn function, makes 110 decibel loud horn sound when press remote to let cars/pedestrians/drivers know you're coming. 3 horn sounds for your choice. IP64 Waterproof level make this bike turning light can be used in small to moderate rain in the temperature of in -4-140F. Your best partner for outdoor biking. Cycling Safety Mountain Bike. WIRELESS REMOTE & USB RECHARGEABLE - Come with wireless remote which clamps easily to 0.78-0.94 inch handlebar. Strong wireless range up to 66ft. Comes with USB-C charging cable, build in rechargeable 3.7V 2000mAH lithium battery, at 7h full charge the taillight alarm can work up to 70 hours (on fast blinking mode)