The SB-1 is designed with a ¼ inch instrument input and a thru-put, perfect for connecting to your tuner or on-stage amp. The active circuit quickly converts the signal from high to low impedance, minimizing noise. The signal is then buffered and balanced for long cable runs to your PA system. Plus, with 48 volt phantom power, you don't need batteries or any external supply. Just plug in and you're good to go!