Samson's MD1 Mono Passive Direct Box combines premium sound circuitry with durable, roadworthy construction, providing high-quality signal connection solutions for a variety of live sound and recording applications. The MD1 allows clean, balanced lines to be sent from an unbalanced line or instrument signal to a microphone level balanced input. Features include: · All-metal, impact resistant design · Samson STL transformer · Ground Lift switch · 1/4 inch. Input and Thru · Balanced XLR output · No Phantom or Battery power required