... field, through special amplify method it just need 20 meters receiver pole to complete survey.(2) 2 people is enough to ... in the noise road and high electric jamming area for signal via frequency selector and digital processing.Get survey parameter through ... monitor 9. Whole weight.2KG, size: 24CM×13CM×16CMSpare Parts:Signal Receiver/ Sender Rods, Portable Printer, Charger, Bags