FAMILY OWNED & OPERATED - Marathon has been manufacturing precision timing instruments since 1939. Today, they continue their legacy, combining modern design sensibility with Swiss engineering & craftsmanship. MULTIPLE MODES - This clock not only has the features you’d expect (time, day & date), it also has indoor temperature, humidity, and a heat & comfort index. It’s perfect for an office setting where indoor conditions can be linked to productivity. LARGE DISPLAY - The large, highly legible display includes a button-activated amber backlight. ATOMIC DESK CLOCK - Marathon's Atomic Desk Clock is self setting/adjusting using radio frequencies broadcast from NIST’s Colorado Atomic Clock (only functions in North America).