Features: 8 in 1 Function: Digital altimeter， with digital barometer， digital compass， weather forecast， time， calendar， thermometer， and backlight The digital altimeter is designed for outdoor use Forecast the weather for the forthcoming 12 to 24 hours basing on barometric pressure changes Altimeter: -700 ~ 9000m / -2300 ~ 29500ft Weather forecast Resolution: 0.1mbar， 0.1oC History Altitude record : 256pcs records Compass: show bearing in degrees and cardinal point Thermometer : In oC / oF format Clock: In 12 hours or 24 Hours format Battery: by 2 x AAA batteries (Not Included) Size:app.9.1x5.2x2.1cm/3.6x2.0x0.83in Color: Black Quantity: 1 Pcs Package includes: 1 x 8in1 digital altimeter 1 x Lanyards