KeeYees: Best choice in various Electronic Modules & Components, DIY Parts and Tools to support your work and design challenges from Home, School to Industrial applications! How to use it: The level converter is very easy to use, it needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. Take the high voltage (5V) and low voltage (3,3V) for example. 5V connects to HV pin; 3.3V connects to LV pin; Ground from the system connects to GND pin. Package Include: 10 x 3.3V-5V 4 Channels Logic Level Converter Bi-directional Shifter Module 20 x 6Pin Single Row Pin Header.