This BOSS Noise Suppressor NS-2 is a digital unit that comes equipped with Threshold, Decay, and Mode controls. It is perfect for use with acoustic electric guitars, bass guitars, and electric guitars alike. The unit is in excellent shape and is one of the best noise suppressors on the market. This item is a must-have for any guitar player looking to eliminate unwanted noise and feedback from their setup. It is versatile and easy to use, making it an ideal addition to any collection of guitar effects pedals. BOSS NOISE SUPPRESSOR NS-2: 4 INPUTS - INPUT/OUTPUT/SEND/RETURN THIS PEDAL IS USED BUT IN EXCELLENT CONDITION - NO DAMAGE TO EXTERIOR - LIKE NEW