Luminance: 15LM (low power consumption and durable service) - USB rechargeable bicycle taillight and auto cut off when fully charged. 
- O-ring strap suitable most bike cube(12-32mm) ---- Modes: Normally on/ Slow Flashing/ Flashing/ Strobe - Waterproof USB Rechargeable Flashing Night Rear Tail Flashlight Warning Cycling Bicycle - Great for student, baby stroller, jogging, walking, bicycles, car emergency, horse-riding, road emergency&camping, etc. - High quality internal lithium battery,only need about 2 hours to be fully charged while be used for about 12 hours. - Super waterproof,make you riding freely regardless of rain. - High brightness and energy saving LED. 
Specifications: Type: LED Mode: 4 modes Brightness: 15 lumens
 Item Color: Black LED Light: Red, Blue, White Fittings
 Color: Random Suitable Tube Diameter: 12-32mm/0.47-1.26" 
Mounting Placement: bicycle seat post 
Product Weight: 60g Product Size: 7.5 x 3 x 2cm/2.95 x 1.18 x 0.79" 
Package Weight: 100g 
Running time: Long bright: 4 Hours Slow flash: 10 Hours Shun flash: 12 Hours Strobe: 8 Hours Charging time: about 2 Hours