This is the original non SL version. Meticulously cared for - adult owned - non smoking - always stored in mic case. Like new aside from missing the factory included pop filter (which was worthless anyway - much too small to make any noticeable difference). Large Diaphragm Cardioid Condenser Microphone is designed to deliver the same high-quality audio that mic users have come to expect from Blue. Boasting a unique look and highly versatile performance, this pressure gradient cardioid microphone utilizes Blue's renowned mic technology and a Class-A discrete amplifier circuit. The Bluebird microphone can be used in any number of applications, from vocals to guitars, close-miking of drums or drum overheads, percussion, piano, horns, strings, or anywhere else where crystal-clear sound is the top concern.