Mini Size: 57mm*42mm. It does not take up space and is more flexible.It is compatible with lego jack. IIC Port: Independently lead out IIC interface. Enable to plug in IIC components like OLED, BME280, etc.. Widely Used Extension Board: This is a standard GVS interface with 16 channels. It can extend 3V electric brick module. Audio Jack: Headphone is controlled by P0 port. Plug in your headphone, the buzzer will disconnect automatically, we can enjoy music with our headphone. Sensor:bit is a breakout board based on micro:bit. It has extended all available IO ports on micro:bit, and lead out them in the form of GVS. We can extend various 3V electric brick modules like LED light, photocell, etc.. it has integrated a buzzer and an audio jack, which allows us to hear music from the buzzer or with our headphone.