1Made of high quality ABS plastic material, which is durable, corrosion resistant and environmental friendly 2The device is based on the technology of electronic bearing sensor and barometric sensor 3With a rope that very convenient to carry 4For outdoor sports enthusiasts with a wide range of essential and more precise information 5Ideal for outdoor sports enthusiasts made the simple type of equipmentDescription: 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 compass a perfect hand-carry device for various outdoor activates it will give you backlight when you press any button in any time. Features:1. Made of high quality ABS plastic material, which is durable, corrosion resistant and environmental friendly.2. The device is based on the technology of electronic bearing sensor and barometric sensor.3. With a rope that very convenient to carry.4. For outdoor sports enthusiasts with a wide range of essential and more precise information. 5. Ideal for outdoor sports enthusiasts made the simple type of equipment. Specifications:Material: ABSColor: BlackPackage Weight: approx. 94gSize: approx. 9 x 5 x 2cm / 3.54" x 1.96" x 0.78"Strap Material: Cotton FabricBattery: 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 Compass: show bearing in degrees and cardinal point Thermometer(Range): -10 Degree to +60 Degree, (Format ):F/C 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 altimeter1 x rope1 x manualNote:1. Avoid use in rain, damp, too high or too low temperature (working temperature: 0-50, storage temperature: 20-702. Avoid contact with corrosive material such as perfume, alcohol, cleaning agents and so on. 3. Avoid use in a area that maybe effect the magnetic compass normal use:Near the concrete/steel structures Close to power stations Close to home appliances (such as computer, TV, VCD, fax machines, speakers,etc)