Welcome to our store! 1. Features a power indicator: When power is supplied to the Microbit, the indicator light is red. The light will not illuminate if there is no power. 2. PO buzzer jumper cap: The jumper cap for IObit is connected by default. Use the music column block for Makecode to program and make a sound. Usually, there is no sound when the power is turned on. 3. The 3-pin IO port is led out: All pins in the Microbit have been led out without any reservations (P17 and P18 are not available on the Microbit, so the IObit is not led out). 4. The product uses a 40P Microbit horizontal socket and comes in a compact size. 5. Features board mounting holes and fixing holes: The two outermost holes are approximately 4.8 mm in diameter and are compatible with friction pins. The spacing is 48 mm. The two innermost holes are approximately 3.1 mm in diameter and can be tightened with standard M3 screws. The spacing is approximately 32 mm. Item Type: Expansion Board for Micro Bit Material: PCB Packaging: White cardboard packaging Size: Approx. 57 x 37 mm / 2.2 x 1.5 in Outermost diameter of two holes: Approx. 4.8 mm / 0.2 in, spacing: Approx. 48 mm / 1.9 in Diameter of the two innermost holes: Approx. 3.1 mm / 0.1 in, spacing: Approx. 32 mm / 1.3 in Package List: 1 x Expansion Board for Micro Bit Customer satisfaction is our top priority. If you encounter any issues with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.