1. Support the PXT graphical programming interface developed by 2. Support WINDOWS, MACOS, IOS, Android and other operating systems 3. The programming environment is based on WEB , no need to download additional compilers 4. Program the computer through USB programming and emulation 5. The mobile terminal wirelessly writes and emulates the program through Bluetooth V1.5 version parameters Memory: 256kb Flash 16kb RAM External chip: NXP KL26Z 16KB RAM Working current: 90MA Connection: The interface adopts a flat design I2C: bus sharing (multiplexing) I2C bus Wireless: 2.4GHZ radio/Bluetooth 4.0 Supports a of mainstream programming languages including JAVASRIPT, PHYTHON, MBED C Applicable population: primary school, junior middle school and senior high school : windows, MacOS, IOS, Android, etc Programming software: javasript, python, mbed C, etc IOBIT V2.0 expansion board parameters Power supply mode: USB 5V 1A Onboard Features: 5V 1A resettable fuse; Buzzer (P0 interface); 3.5mm audio port (P0 interface); Toggle switch (for switching the buzzer music output and audio port sound output); USB power switch 5 gold fingers, seamless connection with microbit 0, 1, 2, 3V, GND pins to protect microbit gold fingers Provide 5V and 3.3V power interface, support 3-5V sensor module (onboard 5V and 3.3V power indicator) Pins include: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20 Analog feet: 0, 1, 2 Material:PCB colour:black Package Contents: 1 * BBC Development board (Random color, don't accept the specified color) 1 * IO BIT V2. 0 Expansion Board Only the above package content, other 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.