This multifunction digital compass is designed to deliver extensive, altimeter, weather, altitude, compass, thermometer, clock, calender, blacklight. It is designed multipurpose. It serves for you timely during your traveling. 1) Altimeter range: -700 to 9,000m or -2,300 to 29,500ft 2) Thermometer both in C and F 3) Clock: 12/24 hours 4) Calendar: with year month and date 5) With backlight function 6) Battery: 2 x AAA batteries 7) Size: 90 x 50 x 18mm 8) Weight: 48g

http://olla.gr/8-in-1-altimeter-weather-altitude-compass-thermometer-clock-calender-led-backlight-multifunction-digital-altimeter-watch-compass/