Smart Bike Tail light Sensor Brake Bicycle Rear Light Saddle Seat Light surface kb available to charge 4 batteries

available to charge 4 batteries at a same time

and daily use

Long Battery Life: Built-in 2×21700 lithium batteries (8000mAh) provide 3-150 hours of runtime from 20 to 1200 lumens

No need to buy an extra battery charger for charging it

Smart Bike Tail light Sensor Brake Bicycle Rear Light Saddle Seat Light surface kb available to charge 4 batteriesFeature: 4 LIGHT MODES: There are 4 light modes for your choice: Slow FlashBreathing FlashFast FlashSteady On Modes. Auto On Off Function: In Low and Fast Flashing modes, it will auto turn on while detect any movement or vibration,ortherwise the bicycle tail light will go to sleep within 30 seconds. 3S Smart Brake Sensing Super Bright: The brightness of this bike brake light is 3 times higher than normal base on the high lumens COB LED; The red light