The device is based on the technology of electronic bearing sensor and barometric sensor. The digital altimeter is designed for outdoor use, the detachable string makes the digital a hand-carry device for various outdoor activates it will give you backlight when you press any button in any time.

Specifications:
Material: ABS
Color: Black
Package Weight: approx. 94g
Size: approx. 9 x 5 x 2cm / 3.54" x 1.96" x 0.78"
Strap Material: Cotton Fabric
Battery: 2 x AAA batteries (not included)
8 in 1 Function:
Altimeter(Range): -700 meters - 9000 meters / -2300-2950ft (resolution ratio-1m/3ft)
Barometer(Range): 350mbar-1100mbar (resolution ratio-0.1mbar) Digital : show bearing in degrees and cardinal point Thermometer(Range): -10 Degree to 60 Degree, (Format ):¡ãF/¡ãC Weather Forecast: Start the machine, it can forecast the weather in the next 12-24 hours, the effective range of 30-50km LED Backlight: In any state, press any key to open the backlight, when open backlight, press any key to extend the time of 5 seconds Clock Format: 12Hr/24Hr (AM/PM) Battery: 2 x AAA batteries (Not Included)

Package Included:
1 x digital altimeter
1 x rope
1 x manual

Note:
1. Avoid use in rain, damp, too high or too low temperature (working temperature: 0-50, storage temperature: 20-70
2. Avoid with corrosive material such as perfume, alcohol, cleaning agents and so on.
3. Avoid use in a area that maybe effect the magnetic normal use:
Near the concrete/steel structures Close to power stations Close to home appliances (such as computer, TV, VCD, fax machines, speakers,etc) Close to the bridge which made from lots of steel or metal Close to the running vehicles (cars, trains, airplane) Near or on the of the metal plate