The SWP-PTT is a switch plate with push to talk switch with LED indicator and finished in low reflective black. Robust switch plate with push to talk switch. Switch contacts can be wired for normally open or normally closed operation. Switch plate contains a 3 leg bi-colour LED indicator for visual status of microphone. LED requires a separate supply (30ma – 2.5 Volt). The following models can be used in conjunction this switch: Clockaudio C 011E-RF, C 012E-RF, C 003E, C 003E-RF, C 004E, C 004E-RF and SM 20-RF products.