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amplifier circuit. Do not use another amplifier to use! The output of
the two amplifiers cannot be connected in parallel or the negative poles
are connected together, otherwise the power amplifier chip will be
battery (lithium battery needs to have a protection board!) comes with a
USB charging port for lithium battery charging, USB port can also be
used as a power supply port or 5V adapter power supply. Can not use dry
battery, charging treasure, Power supply with unstable voltage and
current such as multi-function transformer!
try not to be close to the metal parts of the Bluetooth antenna, so as
not to affect the transmission distance.