Waterproof LCD Multifunction Digital Compass Barometer Altimeter Clock Calendar Features: Adopt super-accuracy sensor from Swiss. Altitude total gain/loss, 24 hours altitude record and chart. Max/min altitude, temperature, huminity record. 24 hours air pressure trend chart. Incorporates altimeter, barometer, compass functions, etc. Thermometer, hygrometer, time, date, alarm clock, LED torch. Built-in rechargable battery. LCD backlit. IPX 4 waterproof. Specifications: Altimeter: Altimeter range(-700 to 9000m/-2296 to 29500ft) Resolution of 1 meter/feet 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 Barometer: Pressure range 300hpa to 1100hpa(8.84inHg to 32.44inHg) Resolution of 0.1hpa(0.01inHg) 24 hour pressure history and graphical display Electronic pressure weather forecast(sunny, slightly cloudy, cloudy, rainy) Pressure trend indicators Thermometer: Range from -20 to (-4 to 140) Max./Min. memory for temperature Hygrometer: Relative humidity(20% - 95%) Max./Min. memory for relative humidity Package: Material: Plastic Color: Black + yellow Built-in battery: 300mAh Item size: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8in Item weight: 70g / 2.5oz Package size: 16 * 11 * 3.5cm / 6.3 * 4.3 * 1.4in Package weight: 128g / 4.5oz