Active Pickup for Violin with Nanoflex Technology. NFX pickup system 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 just reproduce 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. This is why the best violin players in the world are using the Shadow SH 945 NFX violin Nanoflex pickup system. The pickup mounts easily under the bridge and senses the vibrations of the bridge and the body. Control unit with volume and tone controls mounts on violin side with chin rest type assembly. The control unit has an input for the Nanoflex pickup and standard 1/4'' jack output, anduses a standard 3V cell battery (2032) providing about a year's use.