Description:
This is a MP3 Bluetooth decoder card. It has buttons and selector switches, as well as a power interface and a micro interface.

Feature:
Bluetooth version 5.0
Two-channel audio output
Your volume can be adjusted.
It has a Bluetooth display and a power indicator to indicate the working status.
Specifications:
Product name: MP3 Bluetooth decoder board.
Power supply voltage: 3.7 V ~ 5 V.
Operating voltage: 20 mA.
Charging current: 300mA (max.)
Bluetooth display: blue
Power indicator: red.
Working temperature: -25? ~ 85?
Working humidity: 5% ~ 95% RF.
Size:32×30.5×7.5 mm.
DIP Switch:
Dial-up: power for the battery connection. If no battery is available, MICRO delivers indirect power.
Dial down: MICRO delivers direct power. If there is no micro power, turn off the power.
The dip switch is fragile. Please protect the switch during use to avoid damage.
MICRO indirect power supply can cause noise due to insufficient power supply.