Check the listing for details. PreSonus MicroStation BT 2.1 Monitor Controller w/ Bluetooth Wireless Audio. Condition: Used, Made in China. Listed at 80.00 USD. used PreSonus microstation bt. works great and super clean audio, just some strange rust coloring around the inputs. doesn't affect the audio at all. selling because I just don't need it in my setup anymore PreSonus MicroStation BT 2.1 Monitor Controller is a versatile USB audio interface designed for musicians and audio professionals. With six channels and six phono inputs, it offers ample connectivity for monitoring and playback. The compact console/tabletop form factor makes it easy to integrate into any studio setup. Featuring Bluetooth wireless audio capabilities, this interface allows you to effortlessly stream audio from your devices for added convenience. Perfect for musicians looking to enhance their monitoring experience.