The Rapco Horizon ISOBLOX is a compact 600 ohm to 600 ohm in-line transformer isolation module with XLR (male) to XLR (female) connectors. It effectively isolates 60-cycle hums and other outside noise that can be caused by older electrical systems, or when interfacing equipment together that is located in separate areas. The ISOBLOX line isolator also reduces the chance of the guitarist who sings of getting shocked from an isolated mic signal.