VSL-251SKU: 50330 - VSL-251 quantity + ADD Description Installation & Specification Description ANALOGUE INTERCOM TERMINAL VSL-251 Analogue audio intercom terminal Local power (12-36 V d.c) Single call button (red) Water and vandal resistant 316 stainless steel Optional 1 x relay NC/NO type Installation & SpecificationDownload VSL-251 Specification (PDF) You may also be interested in SWE-4SS - SWE-4SS quantity + ADD SWE-6 - SWE-6 quantity + ADD SRH-1 - SRH-1 quantity + ADD FWE-14 - FWE-14 quantity + ADD