... + Filter + X’Tal. + PCB antennaWireless communications module conforming to Bluetooth version 2.1 + EDR, class I. UART, USB, PCM ... echo cancellation, CVSD codec (voicecompression codec), SBC codec (stereo audio compression codec), MP3 codec, AAC codec, and ... A2DP sink to less than 80msApplications, stereo/mono headset, automotive hands free, wireless speaker, and wireless Microphone bluetooth pcb