Vktech&reg; Waterproof FR500 Multifunction LCD Digital Altimeter Barometer Compass Thermometer Hygrometer Weather Forecast LED Torch Altitude total gain/loss, 24 hours altitude record and chart Incorporates altimeter, barometer, compass functions, etc Thermometer, hygrometer, time, date, alarm clock, LED torch Built-in rechargable battery, LCD backlit. Altimeter range(-700 to 9000m/-2296 to 29500ft)