Portable USB Rechargeable Bike Bicycle Tail Rear Safety Warning Light Taillight Lamp Super Bright

Specifications:
Mode: 3 modes
Brightness:15 lumens
Size:Approx 7.5x3x2cm(L*W*H)
Waterproof:Yes
Running time
Always light: 4 Hours
Strobe: 8 Hours
Slow: 10 Hours
Fast: 12 Hours
Charging time:Approx2 hours