The PDW USB-rechargeable Io taillight has two super-bright LEDs for a great value, and offers a super-quick charge time of only 2.5 hours. The Io has 3 different modes, steady, flash, and pulse, and is perfect for urban riding. - 3 modes (runtime) Steady (10h) Flash (20h) Pulse (20h) - Seatstay mount included - UV-proof rubber strap bracket for easy on and off included - Includes Micro USB-recharging cord