On-board MEMS microphone, providing sound input for :bit, -in LED indicator on the front, external bias circuit ( to ground) 33K:1K-in speaker to play sound In addition to outputting sound through PWM on the pin, :bit V2.2 also has an on-board electromagnetic speaker, which can output sound to complete more experimentsThe logo on the front of the capacitive touch sensor becomes a metal capacitive touch sensor, which can return digital signals to :bit V2.2 like a button up to 200MA current -in discrete voltage regulator chip, which can up to 200MA current for peripheral accessories, providing more support for projects such as camel machine controlCompared with the previous generation :bit v1.5, :bit V2.2 has the same and 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 easeProduct: : bit V2.2Suitable for the crowd: students and enthusiasts above elementary school)Processor: 512kb flash 128K RAMSize: 43x52mmProgramming environment: online programming + local programming Programming languages: makecode, Python, ScratchOnboard components: I/O signal port, Bluetooth, electronic compass, programmable buttons,LED dot screen, accelerometer, microphone, touch-sensitive LOGO buzzerConnecting external devices: , expansion boardsWireless connection: 2.4GHz wireless network 4.0BLE Bluetooth supply: -usb 5v supply, 3V interface or battery box supplyOutput current: 200 MAColour:blackMaterial:PCBPackage Contents:1 x :Bit V2.2 Development Board(random colors, ' accept the specified color) 1 x USB Cable(random colors, ' accept the specified color)Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.