Bluetooth power amplifier board 2x6W Lithium battery charging management HF69B

Feature:

Bluetooth power amplifier board standby heating small stereo sound quality is better for small Bluetooth speakers
Output power: 6W + 6W dual channel stereo
Speaker impedance: 6 ohm, 8 ohm (if the speaker impedance is too small, the volume will be turned off)
Power supply voltage: 5VDC or 3.7V lithium battery (if the wiring is too long in use, the battery will lose power, and the voltage is too low, the volume will be slightly turned off, and the sound will be cut off)
Power supply current: more than 1A (when the power supply current is not enough, the sound will break when the volume is opened)
Charging interface: When the lithium battery is used for power supply and the charging interface being 5V power supplied ,it can charge a single lithium battery (the charging management circuit limits the maximum voltage of the battery to 4.2VDC)

Friendly reminder: when the slide switch is on, the micro USB port is the charging port, which can work only when powered by lithium battery. When the slide switch is off, the micro USB port is the power supply port, which can work without lithium battery.
Please check the power supply when the volume of the product is turned on and the horn is broken. When the output current of the power supply is not enough, there will be intermittent sound. Speakers with low impedance are not recommended.