Feature:<br> The device is based on the technology of electronic bearing sensor and barometric sensor <br> 8 in 1 Function: Digital altimeter, with digital barometer, digital compass, weather forecast, time, calendar, thermometer, and backlight <br> The digital altimeter is designed for outdoor use, the detachable string makes the digital compass a perfect hand-carry<br> device for various outdoor activates it will give you backlight when you press any button in any time <br> Specifications: <br> Calendar <br> Backlight v Weather forecast<br> Weight: 70g <br> Size: 90 x 50 x 18 mm <br> History Altitude record : 256pcs records <br> Altimeter : -700 ~ 9000m / -2300 ~ 29500ft <br> Compass: show bearing in degrees and cardinal point <br> Thermometer : In °C/ °F format <br> Clock: In 12 hours or 24 Hours format <br> Battery:by 2 x AAA batteries (Battery is not included) <br> Package Contain: <br> 1 x 8 in 1 digital altimeter <br> 1 x rope <br> 1 x English Manual<br>