The first full-isolation interruptible foldback (IFB) in-ear monitors for broadcasting, teleprompting, and security teams, the 321 provides 37 dB of broadband isolation from ambient sound, lowering the noise floor so that audio can be understood even in the noisiest environment without raising the volume. Its low profile, custom-molded design allows the 321 to fit perfectly in your ear, and the soft silicone is incredibly comfortable, even during prolonged use. With its near-invisible cable, the whole assembly is quite discreet. The 321 is available is compatible with a wide range of intercoms, and can be ordered as single (one ear) or dual-mono (two ears).