Multifunctional digital altimeter based on electronic bearing sensor and air pressure sensor technology. Designed for outdoor use; includes a detachable lanyard for convenient hand-carry or neck-carry during climbing, hiking, fishing, camping, and other outdoor activities. 8-in-1 LCD multifunction digital altimeter featuring digital barometer, digital compass, thermometer, weather forecast, clock, and calendar. LCD display with backlight for easy reading in low-light conditions. Stores up to 256 historical altitude and air pressure records. Powered by one 3V CR2032 button battery (battery not included). Press and hold the 'SET' button for 5 seconds to enter dormancy mode and conserve battery life. Compact pocket-sized design with lightweight construction; includes lanyard for portability. Made from durable ABS material, suitable for outdoor use including climbing, fishing, hiking, and camping. Screen: LCD with backlight Altimeter range: -2296 to 29500 ft, resolution: 3 ft Barometer range: 350–1100 hPa, resolution: 1 hPa Compass accuracy: ±3°, resolution: 1° Thermometer range: -5°C to 50°C (23°F to 122°F), accuracy: ±2°C, resolution: 1°C Temperature unit: selectable (°C/°F) Weather forecast: next 12–24 hours (Sunny, Slightly Sunny, Cloudy, Rain) Time format: 12H / 24H Time display: hours, minutes, seconds Calendar: month, date, year Power supply: 1 x 3V CR2032 button battery (battery not included) Item size: 93 x 54 x 15 mm / 3.66 x 2.13 x 0.59 in Item weight: 47 g / 1.64 oz Color: As shown Material: ABS Package contents: 1 x multifunctional altimeter