this clock have several nice feature include a variable back-lighting feature . the brightness of the back-light be control by a dial located on the rear of the clock . one drawback be the Alarm On\/Off switch . it be not easy to locate early in the morning . the switch be recess into the right side of the clock and be a slide type , not a toggle switch . the product write-up say it use a ` c ' battery however the one I receive from Amazon use two ` aa ' battery -lrb- also not include -rrb- . it may be a little too large to serve as a convenient travel alarm clock .