this alarm clock be just what we be look for - easy to use and have a small footprint on we nightstand . it would easily fit in you pocket or a purse . when close , it measure just under 2 1\/2 `` w x 3 1\/2 `` l x 5\/8 `` D. it come with a `` button '' battery , rather than the more easy to replace aa or aaa battery . since we have no idea how long the battery will last , we decide to just buy a new battery and keep it on hand in the nightstand drawer . the Energizer model be 357\/303 -lrb- also #ag 13 , lr44 , exp76 -rrb- . these battery be sell at hardware store , Radio Shack , etc. .