Features:If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The CJMCU bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time. This level converter also works with 2.8V and 1.8V devices. What really separates this Logic levelconverter from our previous versions is that you can successfully set your high and low voltages and step up and down between them safely on the same channel. Each level converter has the capability of converting 4pins on the high side to 4 pins on the low side with two inputs and twooutputs provided for each side.Specifications:Channel: 4-channleSize: 2*1.7cm/0.79*0.67inWeight: 3g(approx.)Package Includes:1 x Module2 x Pin Headers