The Stix Switch 2-Pack features the ability to switch between red and white modes with a press of the power button. So, if you need extra light up front, more visibility at the rear, or a traditional front/rear combo, the Stix Switch 2-Pack delivers. 
Features: Headlight or taillight, Charges in the USB port of any laptop or phone charger in two hours (no extra cables needed), Flexible mounting system works with handlebar and seatposts from 22.2mm up to 35mm in diameter and more.