Pickup system for double bass with active equalization to be attached to the jumper. Shadow's Nanoflex technology does not compromise to preserve the characteristics of the instrument. Built to reproduce vibrations in an authentic way for every type of sonority. Do not change the set-Up to install this pickup system and detects and amplifies not only the vibrations of the strings, but also those of the jumper and the body of the instrument. No other pick technology-Up Returns this high level of sound playback. Thanks to the active amplification and the 100% shielding no sound loss occurs and the elimination of the buzz is guaranteed. The pickup is easily mounted under the bridge. Control unit with volume potentiometer and tone mounted on the ropes between the bridge and the cordiera. The control unit equipped with pick up for picks-Up and standard jack output from 1/ 4, 3V battery (2032). Plays the instrument's vibrations in an authentic way. Easy installation without damaging the instrument. Elimination of 100% hum and noise. Super sensitive Nanoflex pickup. Volume control and tone with output from 1/ 4. 3V cell battery. Very low energy consumption.