Taiwan Advance Creative Techonology! MIT only. The only "Magical Mic" Bluetooth Earphone in market!! Magic Mic bluetooth earphone with world wide patent! No surrounding voice except the caller, will be received by the phone receiver. All sounds from caller's surrounding will be eliminated. The mic will delete all source of background noise. Only the caller's sound can be heard by the receiver. Magic Mic will delete noise up to 90dbs (option). Welcome customized design for ODM/OEM and exclusive distributor/agent.