The City Rover Io set consists of the City Rover 700 lumen USB rechargeable headlight and the Io USB rechargeable taillight. The City Rover 700 has a powerful lithium-ion battery and a darkness destroying CREE LED bulb with side illumination. The Io has 3 different modes, steady, flash, and pulse, and is perfect for urban riding. Features: Both lights are USB rechargeable Io runtime up to 20h, City Rover up to 36h on daytime flash modes Headlight has 5 modes for 2-36h run time Headlight has additional 15 minutes in low power safety mode after low battery indicator light comes on Headlight wakes up in last mode used Taillight mounts vertically or horizontally Headlight 125g, taillight, 53g Specs: Recharge Type USB Lumens Front 700