2pcs USB Rechargeable Bike Bicycle Cycling 4 Modes LED Front Rear Tail Light Lamp Specifications: 1. Mode:4 modes 2. Brightness:15 lumens 3. Item Color:,Red 4. LED Light: red 5. Package Weight:50g 6. Product Dimension:7x 2x 1.7cm 7. Mounting Placement:bicycle seat post 8. Bulb Type:LEDs 9. Suitable Tube Diameter:12-32mm 10.Water Features: USB rechargeable bicycle taillight and auto cut off when fully charged. High quality internal lithium battery, need about 2 hours to be fully charged while be used for about 12 hours. Long Bright----4 Hours Slow Flash----10 Hours Super Flash----6 Hours Strobe Flash----8 Hours 4 modes:Long Bright,slow flash,explosion flash and strobe. Super ,make you riding regardless of rain. High brightness and energy saving LED. Package include: 2x Bicycle Tail light 2x USB cable Note: 1.Please allow 1-3mm differs due to manual measurement. 2.Due to the different display and different light, the picture may not reflect the actual color of the item. . 3.As the tail light is new,maybe have some low battery case. Please charging before using.If this makes some trouble for you,we really feel sorry. 4.Please long press to on/off.