Digital altimeter, with digital barometer, digital compass, weather forecast, clock, calendar, . The device is based on the technology of electronic bearing sensor and air pressure sensor. The digital altimeter is designed for outdoor use, the detachable string makes the digital compass to a perfect hand-carry device for various outdoor activities. Specifications: Model: ZD-2028 Material: ABS Digital Electronic Compass Accuracy: 3 Resolution: 1 ②Digital Altimeter Range: -700 9000m (-2300 29500ft) ③Digital Barometer Range: 300mbar-1100mbar ④Weather Forecast ⑤History Altimeter and Barometer Records ⑥Digital ℃ or ℉ user option ⑦Digital Clock (2 time zones with 12/24 hours, with hour, minute, second) ⑧Calendar (with year, month, date) ⑨Backlight LCD ⑩ Leveling bubble for increased accuracy Item Size: 118 * 75 * 28mm / 4.64 * 2.95 * 1.10in Item Weight: 100g / 3.52oz Package Weight: 123g / 4.34oz Package Size: 17 * 9 * 4cm / 6.69 * 3.54 * 1.57in Package List: 1 * Digital Altimeter 1 * Lanyard 1 * User Manual (English)