There are two revisions of the micro:bit; V1 and V2. The latest V2 revision has an onboard speaker and microphone and the previous V1 revision does not. 

Both versions work in the same way and you can continue to use the previous revision with all the micro:bit apps and editors as you would expect. If you have older programs saved as hex files, you may need to update them to work with all revisions.

There are a few easy ways in which you can identify which board revision you have.

  1. The Version number (V2.20, V2, V1.5, V1.3B) is printed clearly in the bottom right corner on the rear of the board. If you do not see a number, it is likely you have a micro:bit 1.3 and the number will be printed beneath the black silkscreen paint.
    micro:bit V2 version numbermicro:bit V2 version number
    micro:bit V1 version numbermicro:bit V1 version number

  2. On the back of the V2 device you will see that the label now identifies the MICROPHONE and SPEAKER, and the BLE ANTENNA is gold coloured.micro:bit version 2micro:bit V2
    micro:bit Version 1micro:bit V1

  3. The Edge Connector has handy notches to make it easier to use crocodile clips or conductive thread without it slipping between pins.

    V2 edge connectorEdge connector V2
    Edge connector V1

  4. On the front of the device the micro:bit logo is now gold like the edge connector. This means it can be used as a touch-sensitive input pin.

    Logo micro:bit V2
    Logo micro:bit V1.
    Note that the previous micro:bit also had
    a yellow logo which is not touch sensitive.