In this chapter, we describe the components of a system for recording EEG and peripheral physiology, how they work, and how they influence the recorded data. We cover electrode types and features that affect data quality, preparation time, and participant comfort. We introduce some examples of peripheral physiology sensors and the technology behind them. We consider the role of the amplifier and what parameters are important to the recorded data. Finally, we consider adding triggers to the setup for recording event markers. At the end of the chapter, you should be able to identify the components of your system, explain what they do, and make decisions about your own setup.