How long batteries last in atomic clocks alarm? and what type of batteries used?

I have a small atomic alarm clock I've had for over two years. This is a Sharp. I lost the instructions. This alarm goes off every morning at six. Do not even have to fix it. How much long do the batteries?

An "atomic alarm clock 'does not use anything special about the batteries … (they are not atomic!). Uses 1 AA battery (alkaline would be better) Setting the alarm check this link: http://i3.tinypic.com/472cyu9.jpg The FULL data sheet is at Amazon: http://www.amazon.com/gp/product/customer -images/B0009OAFOI/ref = cm_ciu_pdp_images_0/105 -5608164-7666847? ie = UTF8 & s = electronics & index = 0 # gallery

Ryan Hummert Last Alarm