The Trinity Pro System is a dual source pickup/microphone system with an external dual-channel pro preamp for guitars and similar string instruments. It features K&K's new and updated Trinity Pro Preamp, which adds a phase switch to the microphone channel for improved feedback resistance and a smoother overall tone. It consists of the award-winning Pure Pickup, the Trinity Microphone with integrated 5" gooseneck and 20-20.000 Hz frequency range, the Trinity Pro Preamp, 2-channel external preamp with adjustable gain-volume-bass-mid-treb for each channel & phase switch for the microphone channel, a stereo endpin jack and a 6-foot stereo cable. Why choose the Trinity System over a solo pickup? The Trinity System delivers an even more authentic tone than the Pure pickup alone. The microphone adds extra air and shimmer to the overall sound, which is very desirable for the purely acoustic guitarist. The mic can be mixed in as much or as little as the situation allows.