Silva Tech4O Data Center II. A multi-functional outdoor instrument that isn't worn on the wrist. It's perfectly sized for a shirt pocket, or clipped to the lanyard & worn around the neck. Measures 3 3/4" x 2 1/8" x 7/8". Black composition housing with lanyard. Electro-luminescent (EL) backlight. Low battery indicator. User replaceable battery - CR2032. Features Altimeter with current altitude and 24 hour history graph; barometer with current pressure and 24 hour history graph; temperature in C or F; weather forecast; digital compass; time 12/24 hr, day-date-time, 2 daily alarms and hourly chime; chronograph with elapsed and split time measurement countdown timer with manual or quick-set modes, pacer 30 to 180 bpm; step counter measures up to 99,999 steps; water resistant to 50M. Boxed with hanging tab.