Features This level converter also works with 2.8V and 1.8V devices. If you've ever tried connecting a 3.3V device to a 5V system, you know how challenging it can be. The CJMCU bidirectional logic level converter is a small device that safely lowers 5V signals to 3.3V AND increases 3.3V to 5V at the same time. Each level converter has the ability to convert 4 pins on the top side into 4 pins on the bottom side with two inputs and two outputs provided for each side. What really separates this logic level converter from our previous versions is that you can successfully tune your high and low voltages and safely up and down between them on the same channel. The level converter is very easy to use. The board must be powered by both voltage sources (high voltage and low voltage) used by your system. High voltage (5V for example) at pin 'H V', low voltage (3.3V for example) at 'L V' and system ground at pin 'GND'. Features: Channel: 4 channels Voltage: 5 V, 3.3 V. Size: 2 x 1.7 cm/0.79 x 0.67 inches. Weight: 3g (approx.) Features: This level converter also works with 2.8V and 1.8V devices. What really separates this logic level converter from our previous versions is that you can successfully tune your high and low voltages and safely up and down between them on the same channel. Each level converter has the ability to convert 4 pins on the top side into 4 pins on the bottom side with two inputs and two outputs provided for each side. If you've ever tried connecting a 3.3V device to a 5V system, you know how challenging it can be. The CJMCU bidirectional logic level converter is a small device that safely lowers signals from 5V to 3.3V AND increases from 3.3V to 5V at the same time. The level converter is very easy to use. The board must be powered by both voltage sources (high voltage and low voltage) used by your system. High voltage (5V for example) at pin 'H V', low voltage (3.3V for example) at 'L V' and system ground at pin 'GND'. Package includes: 1 x Module 2 x Pin Headers Package List