The lezyne femto drive rear light ultra compact aluminum bodied safety light with integrated lens switch cm back cap designed with the clip on system provides versatile strapped or clipped mounting side visibility lens extends beyond body to provide 180 degrees of visibility 2 cr2032 batteries power a single white or red led programmed with 1 solid and 4 flash modes replacement batteries available in 2 pcs and 8 pcs packs available individually or as frontrear pair combinations lez