Your Pioneer 505 Metal Detector incorporates patented microprocessor-controlled technology. The Pioneer 505 is a motion detector; movement over an object is required in order for the machine to detect the object and emit a tone. Alternatively, you can sweep a metal object over a motionless search coil. The Bounty Hunter Pioneer 505 is a great detector that incorporates patented microprocessor-controlled technology to detect coins up to 10 inches deep, and larger objects up to four feet.