The DFRobot micro IO-BOX is a micro bit multifunctional expansion board with on-board Li-ion battery power. This has high-cost boost-buck power management. This 6cm x 6cm board has numerous functions such as Switch 2-way driver motor, 2-way I2C port, 1-way serial port, 1-way buzzer, 4-way RGB LED, Li-ion battery box, charge circuit, emergency power interface, etc. Standard gravity interface
On board buzzer and buzzer Switch