... Power, USB, UART, SPI, PCM interface Bluetooth Profiles: HFP, HSP, A2DP, AVRCP, SPP, bluetooth moudle spp WK-6B * Bluetooth Spec v2.0+EDR Compliant ... Power ClassClass 2Operating Voltage3.3VHost InterfaceUSB 1.1/2.0 or UARTAudio InterfacePCM and Analog interfaceFlash Memory Size8MbitDimension26.9mm (L) x ...