State-of-the-Art Cree H.B. LED technology and advanced electronics supercharges the ExpiliOn’s brightness like never before. With an innovative quick release Li-Ion battery stick, you get brightness for the trails, compact size for commutes,and the ability to swap batteries on-the-fly for extended run times. Featuring 7 lighting modes, USB charging, plus battery low indicator, the Expilion 400 USB provides optimum power and convenience on every ride.