● Module model: SJR-BTM324

● Bluetooth chip: QCC3024, the module has built-in 32M SPI FLASH

● Bluetooth version: 5.1

● Module size: 13mm x 18mm x 2.5mm

● Supply voltage: 3.0-4.3v

Default firmware:

1. Support sbc, aac decoding, no call function, optional I2S, analog output

2. Button description:

● SYS_CTRL: high-level power on, low-level power off, automatically enter pairing mode after booting

● PIO2: Short press to pause, long press for 3 seconds to enter pairing, long press for 5 seconds to clear the pairing record

● PIO3: short press the previous song, long press the volume down

● PIO4: short press a song, long press volume up

● PIO5: connected to high level, not connected to low level

● PIO19: there is audio output high level, no audio low level

3. Indicator light description:

● Bluetooth is not connected: LED0 and LED1 flash alternately and quickly

● Bluetooth is connected: LED1 is always on

● Bluetooth audio playback: LED1 is always on

Note: The four wires of the module must be connected to use the usb sound card, USBDP, USBDN, VCHG, GND