This is a screw terminal expansion board specially designed for Arduino UNO board expansion, through which you can quickly build your own circuit, and the pre-soldered ICSP interface makes it more convenient for you to burn Arduino firmware. The screw terminals are provided with good labels for easy identification. You can use a 40-pin FRC (Flat Ribbon Cable) connector cable to connect all Arduino Uno pins to peripherals. With power on LED indicating. Blue reset button on the side. Features: Easy to install Fit for Arduino UNO ONLY Screw Terminal Nice Label Marker Pre-soldered ICSP Pin Header 40Pin 2x20 2.54mm Horn Socket Connector onboard Terminal block pitch 3.5mm/0.138" Wire size range 26AWG to 16AWG, strip length 5mm Screw M2 steel Pin header and cage copper. Standard IDC40 pitch 0.1" header, you can use 40pin FRC(flat ribbon cable) connector cable connect all Arduino Uno pins to peripheral equipment. Package Includes: 1 x Screw Terminal Hat for Arduino UNO 4 x M2.5 Copper Pillar 4 x M2.5x6 Screw 4 x M2.5 nut For Arduino UNO board expansion Arduino UNO is not included Legal Disclaimer: 1- This is not a brand name product, it is a high quality compatible with Arduino products. 2- Logos or Text on chips or board color may differ than pictures. 3- Please allow slight dimension difference due to different manual measurement.