Waterproof Smart MTB Bicycle Rear Light USB Rechargeable Bike Lights Auto Brake Sensing Cycling LED Safety Warning Taillight? Product Name: Smart Bicycle Rear Light / Night Warning Light Features: 1. Waterproof Grade: IPX65 2. Material: aluminum alloy + PC engineering plastics 3. Size: 4cmx3cm 4. Lamp beads: 16LED (SMD red LED) 5. Battery: lithium polymer battery 6. Charging mode: USB fast charging 7. Brightness: 15 lumens 8. Visuable Range: 200m 9. Run time: 5 hours (strong light) 10 hours or more (weak light) 10. Mode: 5 Mode: Tact switch: (Marquee, Tai Chi, Breath, Fast Flash, Slow Flash) 11. Long press the switch: OFF 12. Double-click switch: turn on/off smart brake mode Package Included: -?Color Box - Lamp Holder - Plastic Buckle - USB Cable - Product Instruction