The Specialized Stix Switch 2-Pack has endless lighting options. The Stix Switch features the ability to switch between red & white modes with a simple, long press of the power button. So, if you need extra light upfront, more visibility at the rear, or a traditional front/rear combo, the Stix Switch 2-Pack lets you do it all. The Fresnel lens provides maximum visibility in all directions. A Flexible mounting system works with handlebar & seatposts from 22.2mm up to 35mm in diameter, as well as most seatstays, with an Aero strap mount available separately. Charges in the USB (Universal Serial Bus) port of any laptop or phone charger in two hours (no extra cables needed). Features Headlight or taillight 2- to 20-hour runtime. Fresnel lens Red/ Green battery charge level indicator. Mode: Output Three white modes Steady: 65 lumens Power Flash: 100 lumens Eco Flash: 35 lumens Five red modes Steady: 18 lumens Surge Glow: 16 lumens Power Flash: 30 lumens Disco Flash: 15 lumens Eco Flash: 8 lumens