Portable, Simultaneous multi-lingual capability. May be integrated into existing PA system. Possible to receive interference from within and without. A channel selection switch remedies the interference. The signal that you want to hear is within this light.
Users use a receiver to pick up the signal.
Can be used in adjoining rooms without interference. Provides security from those outside the room. Can often be integrated into existing PA systems. Can't be used in bright and direct sunlight.