Varia Smart Headlight (UT800), w/Dual Out-Front Mount (010-12384-00)SHINES BRIGHTER FOR LONGER Whether youre riding on the streets or the trail, you wont have to quit when the sun does. WORKS ALONE OR PAIRS WITH EDGE When paired with your bike computer, the headlight automatically adjusts based on speed and ride profile. And you can control the lights yourself with just a quick tap. AUTO BRIGHTNESS CONTROL Select Edge bike computers can detect ambient light conditions and automatically adjust your headlight brightness