Made originally to supply military base mess halls, this wall clock is now available to hang in your office, garage, or workshop. The clock is made with a sturdy, high-impact Polycarbonate case and runs on a highly accurate quartz movement with a silent sweep seconds hand that eliminates the noise most quartz clocks create. While the altimeter function is mock (non-functional), it does work well as a conversation starter. Available in white or black with a mock (non-working) altimeter display, it's a perfect addition to your monochromatic workspace. Single AA battery included for use out of the box.