A device for performing {HEAD ~ electroacoustic functions} including {TAIL ~ noise cancellation}, communication interface, and headphone functions 
including
A device for performing { HEAD ~ electroacoustic functions } including { TAIL ~ noise cancellation } , communication interface , and headphone functions
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH