Features: Bluetooth 4.0, dual MIC, stereo, ROM version 1, ROM, can plug serial Flash or Eeprom 1, 2 stereo headphones, stereo, with double wheat input 2, wired stereo headphones and headsets 3,5 segment EQ can be configured three portable speaker 4, CSR latest version of CVC, support broadband voice and narrowband voice, with wind suppression 5, supports HFP V1.6, support mSBC 6 decoding, support for voice recognition (OK, Byebye) 7, supports 2 Lu calls and two-way audio player 8, supports simple pairing, the near-field and near-field pairing connection 9, audio interface: I2S, PCM 10, serial interface supports: UART, USB 2.0, SPI, I2C 11, supported by SBC, MP3, 12 AAC audio decoding, audio interface cable USB, analog input interface 13, support for smart phones and Tablet PC applications 14, built a switching regulator and a linear regulator, built-in rechargeable 15, no external crystal load capacitance 16, Built-in balun 17,3 LEDs output 18,68_ball, 5.5 * 5.5 * 1mm, 0.5mm pitch, BGA CSR8645 CSR8645 and CSR8640 contrast, applications and functions Ibid; support aptX audio decoding; for sound demanding customers;