Specification: Item Type: Altimeter Material: ABS Approximate weight 92 g (3.2 ounces) Product size: approx. 3.6 x 2.0 inches Black color Battery: 2 x AAA batteries (not included) Function: Altimeter (range): Up to 1000 m/3280 feet (resolution ratio of 3m/9ft) Barometer (range): 350 mbar to 1100 mbar (resolution ratio to 0.1 mbar) Digital compass: displays the course in degrees and base points Thermometer (range): -10 degrees to +60 degrees, (format): °F/°C Weather forecast: start the machine, you can forecast the weather within 12 to 24 hours, the effective range is 30 to 50 km LED Backlight: In any state, press any to turn on the backlight. When the backlight is on, press any to extend the time by 5 seconds Clock Format: 12Hr/24Hr (AM/PM) Package List:1 x Digital Altimeter (batteries not included) 1 x Rope 1 x Manual Note:1. Please allow 0-2cm error due to manual measurement. Thank you for your understanding. 2. The monitors are not calibrated in the same way, the color of the item shown in the photos may be displayed slightly different from the actual object. Please take the real as standard. Features ABS plastic material: the device is made of high quality ABS plastic, durable, corrosion resistant and environmentally friendly. 8 in 1 functions: digital altimeter with digital barometer, digital compass, weather forecast, time, calendar, thermometer and backlight Easy to carry: this device is very comfortable to wear with a rope. Small and portable, has a long service life. Well done: the device is based on the electronic orientation sensor and air pressure sensor technology. It provides a variety of basic and more accurate information for outdoor enthusiasts. Simple type: a simple type of equipment is made for outdoor enthusiasts, easy to use