SpectraCal (TM) - Make your brand noticeable every time someone uses this fantastic calculator and world time clock! It's a pocket-sized device measuring 2 5/8" x 2 1/8" x 3/4", that comes in black and has a slide-out function. It displays the times of 16 cities around the globe, the month, day, and date, and features a countdown and alarm function. Everything is displayed on the large LCD screen on the cover. This item has a battery included. Add your logo and use this to properly advertise your business!