... Class 2 Bluetooth Headphone Module 1.HS/HF, A2DP, AVRCP, OPP, DUN, SPP profiles 2.Class 2 3.UART&USB 4.Small Size MDCS56 Class 2 Bluetooth ... Headphone ModuleIt is a improved model in audio signal control base on MDCS51 bluetooth ... to add wireless capability totheir products.Features:. Bluetooth v2.1+EDR, Class 2. Profiles including HS/HF, A2DP, ...