Wall Amplifier with Volume Controller Knob Background Music Controller

1. Audio format: Support MP3, WAV, APE etc.
2. Bluetooth function: Support pairing of external Bluetooth devices such as mobile phones for audio playback.
3. External sound input: Support external sound source input to the machine, amplified output.
4. Memory card function: external TF card, support 32GB TF card.
5. USB function: Connect USB (support 32GB) to read music, and easily set up family background music space.
6. Volume adjustment: Knob to adjust sound，
7. Power-off memory function: memorize the state played before the last shutdown.