Samson's MD1 Pro Mono Passive Direct Box combines premium sound circuitry with durable, roadworthy construction, providing high-quality solutions for line, instrument and speaker level signals. The MD1 Pro allows balanced lines to be sent from your instrument long distances without inducing noise. Features include: · All-metal, impact resistant design · Samson STLX Mu-Metal shielded transformer · 3-position0dB/-15dB/-30dB attenuation switch · Ground Lift switch · 1/4 inch. Input and Thru · Balanced XLR output · No Phantom or Battery power required