Usage Tips:Multifunctional digital altimeter is based on the technology of electronic bearing sensor and air pressure sensor. It's designed for outdoor use; the detachable lanyard makes the altitude meter a perfect hand-carry or neck-carry device for various outdoor activities like climbing, hiking, fishing, camping and so on. Features: 8-in 1 LCD multifunction digital altimeter, with digital barometer, digital compass, thermometer, weather forecast, clock, calendar. LCD display with backlight, easy to read even in dark environments. The digital altimeter can save 256 pcs history altitude and air pressure record for viewing. Powered by a 3V CR2032 button battery; press and hold the 'SET' button for 5s to enter dormancy mode to save battery. Pocket size and light weight, comes with a lanyard, portable and easy to carry. Premium quality material, with great durability. Perfect for outdoor use, such as climbing, fishing, hiking, camping, etc. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black & Yellow Material: ABS Screen: LCD with Backlight Altimeter: -2296~29500ft Range, 3ft Resolution Barometer: 350-1100hPa Range, 1hPa Resolution Compass: 3 degrees Accuracy, 1 degree resolution Thermometer: -5~50 (23-122) Range, 2 Accuracy, 1 Resolution Temperature Unit: / Selectable Weather Forecast: Next 12 to 24 hours (Sunny, Slightly Sunny, Cloudy, Rain) Time Format: 12H/ 24H Time: hour, minute, second Calendar: month, data, year Power Supply: 1 * 3V CR2032 Button Battery Item Size: 93 * 54 * 15mm / 3.66 * 2.13 * 0.59in Item Weight: 47g / 1.64oz Package Size: 13.8 * 6.5 * 3cm / 5.43 * 2.56 * 1.18in Package Weight: 80g / 2.81oz Package List: 1 * Altimeter 1 * Lanyard 1 * User Manual (English)