Enable Search auto-completer: This setting will start giving suggestions as your visitor start searching:
Auto-submit the form on select a Search option: If this option is selected, the search form will automatically load the detail page of the listing selected.
Min chars needed to trigger autocomplete: Enter a number of characters here before the auto-completer search is triggered.
Max Results to be returned by autocomplete: Enter a number here to limit the number of listings presented by the auto-completer.