The topeak combo aura light set is a great value lightset as it combines the two finest new topeak lights for 2013 the whitelitetrade aura and the redlitetrade aura these two lights are both water resistant and they each have a handy onoff button on the side of the light so you don39t waste battery life each light uses 2 cr2032 batteries 4 in total and come included in this combo light set and as for fitting the whitelitetrade will fit on the front of any handle bar t