No welding, no connection required, just download the program to complete the experiment all module code library files, all tested and to useExpansion ports are reserved to complete other module experimentsCustomized heightened pin headers will not short-circuit with the USB interface of for the boardPCB design, beautiful and generousName: Easy Module Shield Multifunctional Experiment Expansion Board: Easy Module Shield V1: for The function modules are as follows:2-way button module2-way LED moduleFull color LED moduleInfrared receiver moduleBrightness Sensor ModuleLM35D Temperature Sensor ModulePassive Buzzer Module Potentiometer Module temperature and humidity sensor module1 I2C interface (A4 SDA, A5 SCL)1 TTL serial port2 digital ports (D7, D8)1 analog port (A3)reset buttonFully compatible with for R3 interfaceProvides basic experimental modules for beginnersOne board integrates multiple module functionsColour: blackMaterial: PCBSize: 70 x 53mmPackage Contents:1 x Expansion BoardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.