SH 955-NFX is a professional cello pickup which provides absolute natural sound with "0" hum. The pickup is based on the revolutionary Nanoflex technology. Shadow's Nanoflex technology makes no compromise in preserving these features. It is built to reproduce the instrument vibrations authentically with every move of the bow in all positions. No need of instrument modification was a must in developing this absolutely noise and hum free violin pickup system. Nanoflex pickups do not only take the vibrations of the strings like common undersaddle pickups. Nanoflex senses the vibrations of the strings AND the body of the instrument simultaneously. No other pickup technology gives you this high level of sound reproduction. Due to active amplification directly at the pickup and 100% shielding of the entire system, no sound will be lost and no hum created. No modification on instrument needed!Reproduces the instrument vibrations authentically, Easy installation without damaging the instrument, 100% hum and noise free, Super sensitive Nanoflex pickup, Volume and tone control, 1/4" output socket, 3V cell battery, Very low power consumption