3 AAA batteries for 100 hrs, $30 at LLBean or REI(any good outdoor stoor).
Handy, don't disturb spouse at all, and double as good walking light or general flashlight.
I just got her another one for last christmas, she loves it.
06 Wilderness 2952BS
03 Ram 3500, CTD, Crew Cab, 4X4, DRW, 6 spd, pacbrake, aFe stage 1 mega cannon with Torq tube.