Developer's DescriptionBy Yury GrebenkinEcho Locator uses speaker and microphone.Echo Locator uses speaker and microphone.Maximum distance: 2.5 mMinimum distance: 0.5 mDetectable distance difference: 0.06 m-- automatic adjustment-- works in noisy environmentsMANUALMake sure that the sound volume is low.Press SCAN.After a few seconds a graph will appear progressing clockwise.Adjust sound volume so that picture in the graph becomes distinguishable.Use reflector dishes, external speakers and microphones.Move the locator system to match current direction displayed.Keep ears away from loud unnatural sounds like those produced by the app.