1. This equipment is an equipment for outdoor sports enthusiasts. 2. Provide outdoor sports enthusiasts with rich and accurate information, such as electronic altimeter with backlight (weather forecast and altimeter and compass and barometer and clock). 3. Functions: altimeter, barometer, level, weather forecast, compass, thermometer, calendar, time, backlight. 4. Scope of application: Hiking, camping, mountain climbing, and other outdoor places. Batteries:2 x AAA batteries (not included) altimeter: Measuring range:-700m-9000m(-2300-2950ft) (initial test can calibrate the altimeter) Resolution:1 meter or 3 feet barometer: Measuring range:300mbar to 1100mbar Resolution:0.1 mbar. Electronic compass: 8-azimuth mode display External magnetic field correction Accuracy:3 degrees Resolution:1 degree thermometer: Measuring range:-10 - and60 (, optional) Resolution:0.1 degree Weather forecast and time: Weather forecast 12 to 24 hours from now 4 weather conditions:sunny - semi-clear - cloudy - rainy 24 hour clock Electronic backlight:5 seconds high brightness blue LED electronic backlight Colour:Gray Material:ABS Package Contents: 1 x Altitude measuring instrument Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.