Features: IObit expansion board is a powerful microbit expansion board, which leads to 19 PIN pins of the Microbit Board. Each PIN pin has VCC and GND corresponding to.You can freely switches VCC to 3.3V or jumper-cap. 5V; with 3 independent 3V3 and 5V pins. I2C SDAandSCL pins and the corresponding 5V and GND pins are provided for module connections such as LCD1602 LCD display for I2C communication more possibilities. With on-board passive buzzer, connected via jumper-cap Power supply methods includes DChead and USB socket power supply. Specifications: Material:Metal PCB board thickness: 1.6mm Small round hole diameter: 3.0mm Large round hole diameter: 4.6mm Product Size: 57mm / 39mm / 15mm USB input voltage: 5V DCinput voltage: 6-12V Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Expansion Board