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Lithium battery rechargeable battery extension board
Buzzer
Power switch
Built-in 140maH lithium battery
micro usb charging
https://youtu.be/e2RCiFNIF9g
Lithium battery rechargeable battery extension board
Buzzer
Power switch
Built-in 140maH lithium battery
micro usb charging
https://youtu.be/e2RCiFNIF9g