The CUI Devices MP3-3501 is a 3.5 mm mono audio plug connector with strain relief, designed to provide high-quality audio connections. This connector is perfect for various audio applications, including headphones, speakers, and audio equipment. The strain relief feature ensures a secure and reliable connection in high-stress environments, preventing damage to the cable or connector. With its compact size and durable construction, the MP3-3501 is an ideal choice for professional audio installations or DIY projects.