Features: Features a high-precision sensor from Switzerland. Displays total altitude gain/loss, 24-hour altitude record, and chart. Records maximum and minimum altitude, temperature, and humidity. Provides a 24-hour air pressure trend chart. Combines altimeter, barometer, and compass functions. Includes thermometer, hygrometer, time, date, alarm clock, and LED light. Built-in rechargeable battery. LCD with backlight. IPX4 water-resistant rating. Note: Do not submerge in water. Specifications: Altimeter: Range: -700 to 9000m (-2296 to 29500ft) Resolution: 1 meter/foot Max/Min altitude memory 24-hour altitude history with graphical display Total altitude gain or loss up to 44999 meters/feet Barometer: Pressure range: 300hPa to 1100hPa (8.84inHg to 32.44inHg) Resolution: 0.1hPa (0.01inHg) 24-hour pressure history with graphical display Electronic weather forecast (sunny, partly cloudy, cloudy, rainy) Pressure trend indicators Thermometer: Temperature range: -20C to 60C (-4F to 140F), switchable Max/Min temperature memory Hygrometer: Humidity range: 20% to 95% relative humidity Max/Min humidity memory Package: Material: Plastic Color: Black + Yellow Built-in battery: 300mAh Product dimensions: 10 x 6.5 x 2cm / 3.9 x 2.6 x 0.8in Product weight: 70g / 2.5oz Package dimensions: 16 x 11 x 3.5cm / 6.3 x 4.3 x 1.4in Package weight: 128g / 4.5oz Package contents: 1 x Altimeter 1 x Charging Cable 1 x Lanyard 1 x Cleaning Cloth 1 x User Manual (English)