Specifications: O-ring strap suitable most bike cube(12-32mm). 4 modes: long bright/slow flashing/fast flashing/strobe. Great for student, baby stroller, jogging, walking, bicycles, car emergency, horse-riding, road emergency & camping, etc. Internal lithium battery, only need about 2 hours to be fully charged while be used for about 12 hours. (Auto cut off when fully charged) Super waterproof, make you riding freely regardless of rain. High brightness and energy-saving LED. Type: Bike Light LED quantity: 5 Pcs Brightness: 15 Lumens Mounting Placement: Bicycle Seat Post Suitable Tube Diameter: 12mm - 32mm/0.47" - 1.26" (Approx.) Running time: Long Bright: 4 Hours Slow Flash: 10 Hours Fast Flash: 12 Hours Strobe: 8 Hours Charging Time: 2 Hours Size: 7.5cm x 3.2cm/2.95" x 1.26" (Approx.) Notes: Due to the light and screen setting difference, the item's colour may be slightly different from the pictures. Please allow slight dimension differences due to different manual measurements. Package Includes: 1 x 5-LED Bike Light 1 x USB Cable 1 x Rubber Belt