Features: Features Swiss super-accuracy sensor. Displays altitude total gain/loss, 24-hour altitude record, and chart. Records maximum and minimum altitude, temperature, and humidity. Shows 24-hour air pressure trend chart. Combines altimeter, barometer, and compass functions. Includes thermometer, hygrometer, time, date, alarm clock, and LED torch. Built-in rechargeable battery. LCD with backlight. IPX4 water-resistant; not suitable for submersion. Specifications: Altimeter range: -700 to 9000m (-2296 to 29500ft). Altitude resolution: 1 meter/foot. Maximum and minimum altitude memory. 24-hour altitude history with graphical display. Altitude total gain or loss up to 44999 meters/feet. Barometer pressure range: 300hPa to 1100hPa (8.84inHg to 32.44inHg). Pressure resolution: 0.1hPa (0.01inHg). 24-hour pressure history with graphical display. Electronic weather forecast indicators: sunny, partly cloudy, cloudy, rainy. Pressure trend indicators. Thermometer range: -20°C to 60°C (-4°F to 140°F). Switchable between Celsius and Fahrenheit. Maximum and minimum temperature memory. Hygrometer measures relative humidity from 20% to 95%. Maximum and minimum humidity memory. Material: Plastic. Color: Black + yellow. Built-in battery capacity: 300mAh. Device dimensions: 10 x 6.5 x 2cm (3.9 x 2.6 x 0.8in). Device weight: 70g (2.5oz). Packaging 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).