1,Possess power indicator, power is supplied on the for Microbit, the indicator light is red, and the light does not light if there is no power 2,PO buzzer jumper cap, jumper cap for IObit is plugged in by default, use the music column block in for Makecode to program, make a sound, usually there will be no sound when power on) 3,The 3 pin IO port is led out, all the pins in the for Microbit have been led out without any reservations (there are no P17 and P18 on the for Microbit, it is not that the for IObit is not led out) 4,The product use 40P for Microbit horizontal socket, come with compact size 5,Possess board mounting holes and fixing holes, the outermost two holes are about 8mm in diameter, compatible with friction pins, the spacing is 48mm, the innermost two holes are about 1mm in diameter, can be tightened with ordinary M3 screws, the spacing is about 32mm 1 x Expansion Board for Micro Bit Item Type: Expansion Board for Micro BitMaterial: PCBPacking: White box packingSize: Approx. 57 x 37mm / 2.2 x 1.5inOutermost Two Holes Diameter: Approx. 4.8mm / 0.2in, Spacing: Approx. 48mm / 1.9inInnermost Two Holes Diameter: Approx. 3.1mm / 0.1in, Spacing: Approx. 32mm / 1.3in Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.