PLEASE NOTE: The taillight is fully charged in 2 hours,and it need to long press the button to work USB rechargeable bicycle taillight and auto cut off when fully charged. High quality internal lithium battery,only need about 2 hours to be fully charged while be used for about 12 hours. Long Steady Bright----4 Hours Slow Flash----10 Hours flash in order---12 Hours Strobe Flash----8 Hours 4 modes:Long Bright,slow flash,flash in order and strobe. Super waterproof,make you riding freely regardless of rain. High brightness and energy saving LED. Specifications: Name: Bicycle Rear LED Light Color: Five colors mix Size: 7.5*3*2cm/2.95*1.18*0.79" Material: Plastic Power Supply: USB Charge Lighting Mode: 4 Modes: Long bright/Slow flashing/flashing in order/Strobe Waterproof: Yes Lumens: 15 Lumens Specifications: Headlight Material: PC lampshade ABS lamp covers Size:.6 * 2.9 * 2.2 cm Applicable vehicle tube diameter: 20-40mm Charging time: 3 hours from USB Discharge time: highlight 3 hours, low light 5 hours, glossy 12 hours taillight: Waterproof bicycle taillight Bicycle Rear LED Light Build-in lithium battery USB rechargeable 4 modes Long Bright,slow flash,flash in order and strobe Super waterproof High brightness and energy saving LED Package Included: 1*Front light 1*tail light