TW-12C (Last Time Buy) 11/3/2017 Category: Products, Clear-Com Encore Analog Partyline Systems, Interfaces System isolation for: Clear-Com to Clear-Com, Clear-Com to RTS, RTS to RTS Eliminates grounding problems between intercom systems Matches gains between systems Passes through and translates signaling Hybrid nulling up to 40 dB Built-in setup tone Powered directly from connected intercom system