Features: 8 in 1 Function: Digital altimeter, with digital barometer, digital compass, weather forecast, time, calendar, thermometer, and backlight The device is based on the technology of electronic bearing sensor and barometric sensor The digital altimeter is designed for outdoor use, the detachable string makes the digital compass a perfect hand-carry device for various outdoor activates It will give you backlight when you press any button in any time Forecast the weather for the forthcoming 12 to 24 hours basing on barometric pressure changes Weather forecast Specifications: Altimeter: -700-9000m / -2300-29500ft Resolution: 0.1mbar, 0.1oC History Altitude record : 256pcs records Compass: show bearing in degrees and cardinal point Thermometer : In degree / F format Clock: In 12 hours or 24 Hours format Battery: by 2 x AAA batteries (Included) Main Color: black Size: 9 x 5 x 2cm Net weight: 115g Package include: 1 x 8 in 1 Digital Altimeter 1 x Lanyard 2 x batteries