Welcome to the store! 1. Made of high-quality ABS plastic, durable, corrosion-resistant, and environmentally friendly. 2. The device is based on electronic orientation sensor and air pressure sensor technology. 3. Very comfortable to carry with a rope. Small and portable, it has a long lifespan. 4. Provides a range of basic and more precise information for outdoor enthusiasts. 5. A simple type of equipment made for outdoor enthusiasts. Easy to use. Material: ABS Weight: Approx. 92g / 3.2oz Product Size: Approx. 9.1 x 5cm / 3.6 x 2.0 in Color: Black Battery: 2 x AAA battery (not included) Function: Altimeter (range): Up to 999.9 meters / 3280 feet (resolution ratio 3m / 9ft) Barometer (range): 350mbar-1100mbar (resolution ratio -0.1mbar) Digital Compass: Displays bearing in degrees and cardinal points Thermometer (range): -10 degrees to +60 degrees, (format): °F / °C Weather Forecast: Start the machine, you can forecast the weather within 12-24 hours, the effective range is 30-50km LED Backlight: In any state, press any button to turn on the backlight. When the backlight is on, press any button to extend the time by 5 seconds Time Format: 12Hr / 24Hr (AM / PM) Package Includes: 1 x Digital Altimeter (batteries not included) 1 x Rope 1 x Manual Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!