The Io has 3 different modes, steady, flash, and pulse, and is perfect for urban riding.
5 hours.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. Portland Design Works Io USB Rechargeable Taillight 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 Recharge Type: USB Weight: 54.