Function: 1 Made of high quality ABS plastic, durable, corrosion resistant and environmentally friendly. 2. This device is based on electronic direction sensor and pressure sensor technology. 3 Very convenient to carry with rope. Small and portable, long service life. 4 Provides a variety of basic and more accurate information for outdoor enthusiasts. 5 Simple type of equipment is made for outdoor enthusiasts. Easy to use. Specifications: Condition: 100% Brand New Item Type: Altimeter Material: ABS Weight: Approx. 3.2 oz (92 g) / Product Size: Approx. 9.1 x 5cm / 3.6 x 2.0 inch Color: Black Battery: 2 x AAA batteries (not included) a>Function: Barometer (range): Up to 999.9 meters / 3280 feet (resolution ratio 3 m / 9 feet) Barometer (range): 350mbar-1100mbar (resolution ratio-0.1bar) Digital compass : Bearing and Base Thermometer with spot display (range): -10 degrees to +60 degrees (format): °F/°C Weather Forecast: When you start the machine, you can predict the weather within 12-24 hours, effective range of 30-50 km LED backlight: Press any of the button to turn on the backlight. When the backlight is turned on, press one to extend the time for 5 seconds. Clock format: 12 hours/24 hours (Aa>