If you've to connect a 3.3V device to a 5V system, you know what a challenge it can The 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 8V devices. What really separates this level converter 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 4 pins on the high to 4 pins on the low with two inputs and two outputs provided for each Description: The level converter is very easy to use. The board needs to powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to '', and ground from the system to the 'GND' pin level shifter with 4 channels between high and low Small module with 1.3cm X 1.5cm With 2 rows of 6 pin Compatible with breadboard, can directly use in breadboard Usage: For example: High voltage is 5V, low voltage is 3.3V with 5V connect with 3.3V GND connect the power negative pole x input/output 3.3V TTL input/output 5V TTL transform between x and Package Includes: 1 x transform module 2 x rows of pins