1. On-board MEMS microphone, providing sound input for , built-in LED indicator on the front, external bias circuit (power to ground) 33K:1K. Built-in speaker to play sound In addition to outputting sound through PWM on the pin, V2.2 also has an on-board electromagnetic speaker, which can output sound to complete more experiments 2. The logo on the front of the capacitive touch sensor becomes a metal capacitive touch sensor, which can return digital signals to V2.2 like a button. Provide up to 200MA current Built-in discrete voltage regulator chip, which can provide up to 200MA current for peripheral accessories, providing more powerful support for projects such as camel machine control 3. Compared with the previous generation v1.5, V2.2 has the same excellent and powerful functions. On the basis of the same functions, it adds functions such as speakers and microphones, allowing children to use sound and touch in the classroom. Get with ease 4. Adapter Board parameters. Outgoing interface: PO (audio socket), P1, P2, P8, P12, P13, P14, P15, P16, P19, P20, 3.3V, GND. Power interface: VCC on the board is powered by 3.3V or Micro-USB 5P (5V). It depends on the voltage required by the external module. Be careful not to choose the wrong one, otherwise the motherboard and modules may be burned out. 5. development expansion board has many interfaces, motherboard expansion slot, 3.5 audio socket, 2.54-2P (red)/3P (blue)/4P (yellow), 5 ports/6 ports/6 ports, a Micro-USB 5P , two 3P pin headers. Product: Micro: bit V2.2 Suitable for the crowd: students and enthusiasts above elementary school Processor: 512kb flash 128K RAM Size: 43 x 52mm Programming environment: online programming + local programming tools Programming languages: makecode, Python, Scratch Onboard components: I/O signal port, Bluetooth, electronic compass, programmable buttons, LED dot matrix screen, accelerometer, microphone, touch-sensitive LOGO buzzer Connecting external devices: alligator clips, expansion boards Wireless connection: 2.4GHz wireless network 4.0BLE Bluetooth Power supply: Micro-usb 5v power supply, 3V power interface or battery box power supply Output current: 200 MA color:Black Material:PCB Package Contents: 1 x V2.2 Development Board (Random Color, Cannot select specified color) 1 x Battery Box (Built-In 2 x AAA Batteries) 1 x Data Cable(Random Color, Cannot select specified color) 1 x Adapter Board 1 x Protective Case (Random Color, Cannot select specified color) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.