Mackie MP-320 Owner's Manual page 3

INTRODUCTION
For decades, our renowned loudspeaker designs have been helping
artists perform their best on stage. MP Series Professional In-Ear
Monitors build on that legacy with incredible sound and build quality.
With an array of driver configurations available, MP Series
In-Ear Monitors are perfect for live performance, mixing reference,
and audiophiles alike. And thanks to their specially molded
enclosures, they sit gracefully in your ear with a comfortable,
ergonomic fit and with up to 40 dB of sound isolation.
The optional MP-BTA Bluetooth Adapter makes on-the-go listening
a breeze. Elevate your performance and music with Mackie MP Series
Professional In-Ear Monitors.