Active Pickup and Preamp for Cello with Nanoflex Technology. Designed to authentically reproduce the vibrations of your instrument with every move of the bow in all positions. Nanoflex pickups not only respond to string vibrations, but also sense the vibrations of the body of the instrument simultaneously. This completed shielded system incorporates active amplification in the pickup itself, which makes it 100% hum and noise free. The SH 955 pickup comes equipped with a preamp with volume and tone controls that mounts between the middle strings. Volume and tone control. Easy-to-install, no drilling or milling required. 1/4” output jack. 3V battery. Pickup dimensions: Length: 2 cm, Width: 1,5 cm. Preamp dimensions: Length: 6.7 cm, Width: 3.8 cm, Height: 3 cm