|MP-320 Professional In-Ear Monitors are built on a legacy of incredible sound and build quality for both artists and personal listening. With a triple dynamic driver design, you get a unique level of musical separation and nuance with lots of low-frequency response. And thanks to Mackie's specially molded enclosures, the MP-320s gracefully sit in your ear with a comfortable, ergonomic fit that offers up to 40 db of sound insulation. Optional MP-BTA Bluetooth adapter makes it easy to listen on the go. Elevate your performance and music with Mackie MP-320 Professional In-Ear Monitors.