The EMG-40DC Dual Coil Bass Guitar Pickup employs parallel placed coils (ceramic loaded) to produce a deep low end while maintaining clarity. All of the DC Models are beefy, brilliant, and have more than enough output. The DC also uses the ultra low-noise preamp designed for the EMG- JV model. EMG recommends an 18 Volt supply for extended head room. This EMG pickup uses a 40 Extended housing that is 4 inches (102mm).Package Includes: EMG's exclusive Quik-Connect cable, prewired solid shaft volume/tone control set, output jack, battery clip set, and adjustment screws.