1.Please refer to measurement. Slight measurement errors are allowed within the normal range. 2.There may be a slight color difference due to the monitor, camera or other factors, please refer to the actual product. 3.If you are satisfied with the product, please leave us a 5-star praise, us if you have any questions. 4.Follow the store, you can receive fan special coupons, come to follow the store! Features: 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----2 Hours Slow Flash----10 Hours Super Flash----6 Hours Strobe Flash----8 Hours 4 modes: Long Bright, slow flash, explosion flash and strobe. Super waterproof, make you riding freely regardless of rain. High brightness and energy saving LED. Specifications: Headlights : Material: PC lampshade ABS lamp covers Size:.6.5*2.0*3.5cm Color:black/white Applicable vehicle tube di