Which of the following features can be found in the Passenger Service Unit (PSU)?

The Passenger Service Unit (PSU) is an essential component in the passenger cabin of an aircraft, designed to enhance the comfort and experience of travelers. The features commonly found in the PSU include reading lights and air vents.

Reading lights provide passengers with the ability to illuminate their personal space, enabling them to read or engage in activities during the flight without disturbing other passengers. Air vents give individuals control over their immediate airflow, allowing for personal comfort during varying cabin temperatures. This functionality is particularly important on longer flights where personal comfort can significantly affect the passenger experience.

While emergency lighting, Wi-Fi access points, and flight attendant call buttons are all crucial aircraft features, they do not belong to the PSU. Emergency lighting is typically found in different areas of the aircraft to illuminate escape paths in an emergency. Wi-Fi access points are generally part of the aircraft's communication systems and are not confined to the PSU. Flight attendant call buttons, while essential for communication with flight crew, are typically located elsewhere in the cabin for ease of access.

Thus, the correct answer emphasizes the specific functions of the PSU in improving passenger experience during flight.