MDCS56 Class 2 Bluetooth Headphone Module 1.HS/HF, A2DP, AVRCP, OPP, DUN, SPP profiles ... 3.UART&USB 4.Small Size MDCS56 Class 2 Bluetooth Headphone ModuleIt is a improved model in audio signal control base ... . However, establishing Bluetooth data connections with iOS devices requires a unique discovery/paring sequence and authentication process with the Apple authentication ...