This multifunctional digital altimeter uses electronic bearing sensor and air pressure sensor technology. Designed for outdoor enthusiasts, the detachable lanyard makes it perfect as a handheld or neck-worn device for climbing, hiking, fishing, camping, and more. Features: 8-in-1 LCD multifunctional digital altimeter with digital barometer, digital compass, thermometer, weather forecast, clock, and calendar. Backlit LCD display for easy reading, even in dark environments. The digital altimeter can store 256 sets of historical altitude and air pressure data for review. Powered by a 3V CR2032 button cell battery; press and hold the 'SET' button for 5 seconds to enter sleep mode and conserve battery life. Pocket-sized and lightweight, comes with a lanyard for portability and easy carrying. Made with premium quality materials for exceptional durability. Ideal for outdoor activities like climbing, fishing, hiking, and camping. Note: Size and color may vary slightly due to manual measurement and different lighting conditions. Thank you for your understanding. Specifications: Color: Black & Yellow Material: ABS Display: LCD with Backlight Altimeter: -2296~29500ft Range, 3ft Resolution Barometer: 350-1100hPa Range, 1hPa Resolution Compass: 3-degree 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 Cloudy, Cloudy, Rain) Time Format: 12H / 24H Time: Hour, Minute, Second Calendar: Month, Date, Year Power Supply: 1 * 3V CR2032 Button Cell 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)