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 + altimeter + compass + barometer + 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 feetbarometer:Measuring range:300mbar to 1100mbarResolution:0.1 mbar.Electronic compass:8-azimuth mode displayExternal magnetic field correctionAccuracy:3 degreesResolution:1 degreethermometer:Measuring range:-10 - +60 (, optional)Resolution:0.1 degreeWeather forecast and time:Weather forecast 12 to 24 hours from now4 weather conditions:sunny - semi-clear - cloudy - rainy24 hour clockElectronic backlight:5 seconds high brightness blue LED electronic backlightColour:GrayMaterial:ABSPackage Contents:1 * Altitude measuring instrumentOnly 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.