1.measure area and length of any shape (containing mountainous land, slope and flat field). 2.can display measuring value, figure track and automatically calculate price after measurement. 3.vehicle-carrier measurement, distance can be adjusted according to needs. 4.test data , graphics trajectory can be exported for printing. 5.applicable google map shows real graphics trajectory 6.2.8 inch large color screen that makes more clear and visually. 7.efficient startup: 30sec for cold boot, 3sec for warm boot. 8.1 pcs of 3.7v/ 2000mah batteries included benefits: 1. can save and export 99 historical data and figure track. 2. low battery reminder and auto-off time adjustable. 3. measure temperature and humidity 4. measure barometric pressure 5. analysis of satellite signal 6. currency detection, lighting and background light and canlender