Description Features:Adopt superaccuracy sensor from Swiss.Incorporates GPS, altimeter, barometer, compass functions, etc.Thermometer, hygrometer, time, date, alarm clock.Altitude total gain/loss, 24 hours altitude record and chart.Max/min altitude, temperature, huminity record.24 hours air pressure trend chart.Builtin rechargable battery.LCD backlit and LED torch.IPX 4 waterproof. (Do NOT submerge in water.)Functions:GPS Course Return:Direction, distance, speedGPS course return selectionAltimeter:Altimeter range(700 to 9000m/2296 to 29500ft), with 1m/feet accuracy.Max./Min. memory for altitude.Altitude history and graphical display of the last 24 hour altitude readings.Altitude total gain or loss: 44999 meter/feet range.Sea level altitude setting.GPS distance, speed, erect ascending/descending rate, course return record.Barometer:Pressure range 300hpa to 1100hpa(8.84inHg to 32.44inHg)Resolution of 0.1hpa(0.01inHg)24 hour pressure history and graphical displayElectronic pressure weather forecast(sunny, slightly cloudy, cloudy, rainy)Pressure trend indicatorsSea level air pressure setting.Compass:DirectionAngleThermometer:Range from 20 to 60 (4 to 140) and selectableMax./Min. memory for temperatureHygrometer:Relative humidity(20% 95%)Max./Min. memory for relative humidityTime:Hour, minute, secondYear, month, day, dateAlarm clockTime zone settingSpecifications:Material: PlasticDimension: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8inWeight: 75g / 2.6ozPackage Size: 15.8 * 11 * 3.5cm / 6.2 * 4.3 * 1.4inPackage Weight: 126g / 4.4ozPackage List:1 * Altimeter1 * Charging Cable1 * Wrist Strap1 * Cleaning Cloth1 * User Manual