This PDW light set consists of the Pathfinder 200 lumen USB-rechargeable headlight and the Io USB-rechargeable taillight. The Pathfinder 200 has a powerful lithium-ion battery and a darkness-destroying CREE LED bulb. The Io has 3 different modes, steady, flash, and pulse, and is perfect for urban riding. - Headlight: 4 Modes: Steady low (4 hours), Steady high (2 hours), Pulse (8 hours), Daytime Flash (25 hours) - Headlight: Vertical Cutoff Beam focuses beam into perfect bike path pattern while shielding the LED to prevent blinding oncoming traffic - Taillight: Mounts vertically or horizontally - Taillight: 3 modes (runtime) Steady (10h) Flash (20h) Pulse (20h)