Feature: Integrated low-power MCU, RF transceiver, baseband, modem, USB, UART, PCM/I2S, SARADC and 24 GPIOs with Barry Bluelett stack provide low cost, low power, flexible and robust Bluetooth-compatible applications. Description: Product Name: V5.1 Bluetooth-compatible Adapter; Interface: USB 2.0; Transmission rate: maximum 24Mbps; Bluetooth-compatible version: Bluetooth-compatible V5.1; Frequency band: 2.400-2.480GHz; Colour: Black;