The IO-BOX is a multifunctional expansion board for the micro:bit with a built-in lithium-ion battery, slim appearance and easy to use. It features multiple functions in a compact 6 cm × 6 cm board, including a 2-way drive motor, 9-way IO port, 2-way I2C port, 2-way I2C port, serial port, siren, Li-ion battery cell, charging circuit, and emergency power interface
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