·4 LIGHT MODES：There are 4 light modes for your choice, (1)Slow Red Flash:the red light keeps on for 3s when braking on daytime,flash+brake light+intelligent 30s on-off at night(2)Breathing Flash Mode, the red light keeps on for 3s when braking on daytime, flash+brake light+intelligent 30s on-off at night(3)Fast Flash Mode, flashing + brake Light on day and night(4)Steady On Mode, flashing + brake Light on day and night.COB light beads makes you more visible,which is more bright at night.

·BRAKE SENSING AND AUTO ON/OFF: The bike light will highlight to remind the cars and pedestrians behind you when braking to make you safety ridding at night.This Smart bike rear light including Motion Sensor and Light Sensor, auto off when detect in no motion after 30 secs.Once shake it or detect the bike is moving, the bike back light will auto on again.(auto turn on or off in mode 1 or 2).Please choose the mode 3 and mode 4 to avoid Light Sensor working.

·USB RECHARGEABLE& LONG BATTERY LIFE: The Tail Light is built in 260mAh rechargeable lithium battery and it comes with a TYPE-C charging cable that can charges from your computer, power bank, 5V adapter or any device with a USB port. Besides, there is power display:the taillight is slightly bright in charging and turns off when fully charged and the light becomes dim when battery is low.The charging time is only 2h.and , keep running for 7-16 hours.

·IPX6 WATERPROOF & HIGH QUALITY: The waterproof grade of the Bicycle Rear Light is IPX6 soaking grade, which can safe to use even in heavy rain, and it’s more waterproof than most bike lights on the market.What’s more, our light made of high quality ABS+PC material which is more waterproof and durable.It’s also lightweight which only 19 grams.

·2 EASY INSTALLATION MODES: Saddle Bracket and Seat Post two bracket offered to mount on the saddle rail or the seat post to meet your different need. No extra tools needed, unscrews from the mount easily to take with you so it doesn't get stolen.