This multifunctional digital altimeter utilizes electronic layer sensor and air pressure sensor technology. Designed for outdoor adventures, its detachable lanyard allows it to be worn as a handheld or neck-worn device, perfect for climbing, hiking, fishing, camping, and more. Features: An 8-in-1 LCD digital altimeter, featuring a digital barometer, compass, thermometer, weather forecast, clock, and calendar. Easy-to-read LCD display with backlight, even in dark conditions. The digital altimeter can store 256 historical altitude and air pressure data points for review. Powered by a 3V CR2032 button battery; press and hold the 'SET' button for 5 seconds to enter sleep mode and conserve battery. Pocket-sized and lightweight, it comes with a lanyard for easy portability. Crafted from 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 lighting conditions. Thank you for your understanding. Specifications: Color: Black & Yellow Material: ABS Display: Backlit LCD 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, Light Sunny, Cloudy, Rainy) Time Format: 12H/ 24H Time: Hour, Minute, Second Calendar: Month, Date, 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)