Blue's Bottle condenser tube microphone is the company's flagship mic, offering up interchangeable capsules, or "bottle caps," for the ultimate versatility. Applications for the Bottle are numerous; from vocals to hand percussion to piano and strings, the Bottle doesn't disappoint. Fully discrete Class A power using EF86 pentode vacuum tubes imbue your sound with the natural warmth tubes are so well-loved for. The Bottle comes with a precision power supply that can be controlled by a nine-step sensitivity knob that will help you determine the exact polarization voltage to fit your tonal desires.