SMAKN&reg; SPK-8635-B Bluetooth Audio Receiver Module MP3 Decoder And Card Reader Built-in high-quality DAC conversion circuit: SNR 95dB. Kalimba DSP data processor embedded powerful, complete all kinds of digital speech processing. Small size: 15x21mm, compatible with all the product structure. Higher Bluetooth version: Bluetooth V4.0, high software compatibility. Extremely low power consumption: Operating current is less than 2mA.