Portland Design Works Pathfinder Headlight and Io Taillight Set. 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.