The Keystone 4109 is a surface mount audio jack designed for a wide range of audio applications, including computer speakers, headphones, sound cards, and cell phones. Its low-profile design makes it ideal for space-constrained environments. The jack is constructed with polyamide housing, brass terminals with gold flash, and phosphor bronze spring contacts, ensuring reliable performance and excellent signal transmission. Available in mono and stereo versions, the 4109 is supplied on tape and reel, making it suitable for automated assembly processes. It is a versatile solution for connecting audio devices.