Specification:
Fixing on the seatpost,backpack and helmet.
Rechargeable lithium-ion polymer battery
Run time: 3.5~10 hours
Bicycle rear light, backpack light,Helmet light for safe riding and walking

5 Modes Adjustment: 5 Modes: Half-brightness, Brightness , Slow Flashing,Flashing and Quick Flashing , which can be adjusted according to Personal needs.
IPX5 Waterproof: The bike rear light work well even you get caught in the sudden rain, meets daily cycling needs, Don't soak in water or liquid for a long time.Don't soak in water or liquid for a long time.
Safety:The high-powered output will increase your visibility to the vehicles surround you in the dark. Stay safe on the road and make sure to be seen!