What is a TF card for a Bluetooth speaker?

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bluetooth slot Bluetooth Module with MIC Slot, SD card, FM, Pendrive 2×5W Speaker Output Online Buy link  HC-05 6Pin Wireless Serial Bluetooth Module is a Bluetooth module for use with any microcontroller It uses the UART protocol to make it easy   Slot 1: dongle connection Slot 2: Bluetooth Slot 3: Bluetooth And when powering up mouse select the connection(it was bugging me that

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