Rechargeable USB LED Bike Bicycle Tail Red Light Cycling Back Multi LED Colour DescriptionO-ring strap suitable most bike cube (12-32mm).4 modes: Long bright/Slow flashing/Shun 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.Specification:LED Quantity: 5pcs.Brightness: 15 lumens.Color: red, white.Dimension: approx 7.5 * 3 * 2cm.Mounting Placement: bicycle seat post.Suitable Tube Diameter: 12-32mm.Running time:Long bright: 4 HoursSlow flash: 10 HoursShun flash: 12 HoursStrobe: 8 Hours.The charging time of about 2 hours.Note:There might be a bit color distortions due to different computer resolutions.There might be size errors due to different computer resolutions.Package include:2* LED Bike Tail Light.1 * USB Charging Cable.