Select a discoverable mode based on the device initiating discovery.
General Discoverable Mode - The host initiates connection.
Limited Discoverable Mode - A mobile device initiates connection, and the device does not appear in General Discoverable Mode. Note that it can take longer to discover the device in this mode. The device remains in Limited Discoverable Mode for 30 seconds, and green LEDs flash. After 30 seconds it is non-discoverable. To re-activate Limited Discoverable Mode, press the trigger.
