... Interphone,Five Party Talkback TK-T12(1-1)A Details Products Description:Technical parameters: 1.Various ... T12(1-1)49N, TK-T12(1-1)B2.Input voltage: AC220,50HZ3. Output voltage:DC12V/24V ... and group control.3.The composing form is twowire system,three types voltage,24V,12V, ... ,reliable performance and clear communication. About USSUNNY is a 20-year professional manufacturer specialized in designing and ...