Multifunctional digital altimeter based on electronic bearing sensor and air pressure sensor technology. Designed for outdoor use; detachable lanyard allows for hand-carry or neck-carry convenience during climbing, hiking, fishing, camping, and other outdoor activities. Features: 8-in-1 LCD multifunction digital altimeter with 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 readings. Powered by a single 3V CR2032 button battery; press and hold the 'SET' button for 5 seconds to enter dormancy mode for battery conservation. Compact pocket-sized design with lightweight construction; includes lanyard for portability. Made from high-quality ABS material for durability and reliability in outdoor environments. Specifications: Color: Black & Yellow Material: ABS Screen: LCD with backlight Altimeter range: -2296 to 29500 ft, resolution: 3 ft Barometer range: 350–1100 hPa, resolution: 1 hPa Compass accuracy: ±3 degrees, resolution: 1 degree Thermometer range: -5°C to 50°C (23°F to 122°F), accuracy: ±2°C (±3.6°F), resolution: 1°C (1°F) Temperature unit: °C / °F selectable 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 × 3V CR2032 button battery Item size: 93 × 54 × 15 mm (3.66 × 2.13 × 0.59 in) Item weight: 47 g (1.64 oz) Package size: 13.8 × 6.5 × 3 cm (5.43 × 2.56 × 1.18 in) Package weight: 80 g (2.81 oz) Package includes: 1 × Altimeter 1 × Lanyard 1 × User manual (English)