Precise design and reliable performance - Accurate altitude readings with 1 m (3 ft) resolution and a measuring range of about -700 m to 9000 m (-2300 ft to 2950 ft). A practical, portable barometer and altimeter for hikers. - Unique weather forecast capability: predicts weather conditions for the next 12 to 24 hours. Automatically activates after power-on and provides forecasts within an effective range of about 30-50 km (18.642-31.07 miles). - Portable and versatile for outdoor use: lightweight device that can be attached to a backpack or belt for easy access during activities. - Multifunctional all-in-one device: combines weather forecast, clock, calendar, and thermometer. Functions as both an altimeter and a barometer, reducing the need for multiple devices. Use scenarios - Day hikes and ridge traverses: monitor altitude and anticipate changing weather to adjust pace and route in time. - Overnight backpacking or mountaineering: track altitude changes and environmental conditions to plan camps and safety checks. - Outdoor photography, surveying, or travel: quickly reference altitude and forecast to optimize timing and logistics. Note: all specifications reflect the original design and capabilities: 1 m (3 ft) resolution, altitude range -700 m to 9000 m (-2300 ft to 2950 ft), 12-24 hour forecast, 30-50 km range, and integrated clock, calendar, thermometer.