ThorFire Mini Pen Light, Momentary-on Led Penlight EDC Pocket Flashlight, PF01 Runs off Single AAA Battery(Not Included) PF01 pen light has 3 brightness levels, select High mode if you need MAX brightness, Moonlight mode for checking babies or when you don't want to disturb anyone. PF01 flashlight working voltage: 0.8-1.5V. Powered by 1x AAA battery(NOT Included) Sized 105x15mm, fits nicely in hand; Clip it to your pocket; reverse the clip, it's cap light. PF01 LED flashlight has tactical switch for momentary-on without making a sound. Warranty: ThorFire provides customers with 40 days money back guarantee and 18 month warranty service