Qooltek USB Rechargeable Bike Tail Light 2 LED Bicycle Taillight Warning Flashing Lamp 3 Modes (Red) 3 Flashing Models: STEADY/FAST FLASH/SLOW FLASH. Perfect for all road conditions. USB rechargeable battery: 1 hour full charging, 6-10 hours flashing. With USB charging cable. No battery replacement. 10cm elastic strap: It can be stretchable and adjustable for fitting the bike stand. Easy installation: The strap can be easily loosen and fasten, and no tools are required. Perfect for biking in early mornings, late evening and night.