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