Barometer: Displays current barometric pressure upon startup. Press the [ALTI/+] button to switch between barometer and altimeter modes. Altimeter: Shows sea-level altitude of the current location upon startup. In altitude display mode, press and hold [SET] and [ALTITUDE/+] simultaneously, then use [+] or [-] to adjust the altitude value. Relative Altimeter: Resets the current height reading to 0 meters, establishing that position as the reference point. Subsequent elevation changes are displayed as relative altitude. To reset, press and hold [ALTI/+] until “0M” appears at the bottom of the screen, then begin moving—the screen will display relative altitude changes. Press and hold [ALTI/+] again to return to absolute altitude display. Weather Forecast: Provides a general weather outlook for the next 12–24 hours after power-on; effective range is approximately 30–50 km. Time and Settings: 1. Press and hold [SET] for 2 seconds to toggle between 12-hour and 24-hour time format. 2. Press [SET] to enter time setting mode—hour digits flash; adjust with [ALTI/+] or [-]. 3. Press [SET] again—minute digits flash; adjust with [ALTI/+] or [-]. 4. Press [SET]—year digits flash; adjust with [ALTI/+] or [-]. 5. Press [SET]—month digits flash; adjust with [ALTI/+] or [-]. 6. Press [SET]—date digits flash; adjust with [ALTI/+] or [-]. 7. Press [SET]—temperature unit (°C) flashes; press [ALTI/+] to toggle between °C and °F. 8. Press [SET]—pressure unit flashes; press [ALTI/+] to cycle between hPa, inHg, and mmHg. 9. Press [SET]—height unit (M) flashes; press [ALTI/+] to toggle between meters and feet. 10. Press [HISTORY] to exit settings, or wait 10 seconds for automatic exit. Color: Black/Gray Material: ABS Plastic Dimensions: 9 x 5 x 2 cm Package Includes: - 1 x Altimeter Barometer - 1 x English User Manual - 1 x CR2032 Button Battery (battery not included) Note: Actual product color may vary slightly due to lighting and screen differences. Measurement tolerance: ±1–3 cm.