Aiphone - LEF-3 3 CALL MASTERAnalog 3 Channel Master Station The LEF 3 is a selective calling open voice style master station with the capacity of up to 4 total stations. Features Supports up to 4 total master, sub, or door stations LED and tone to announce incoming calls Push to talk to calling master station Hands free communication at responding station Selective monitoring Voice and call tone volume controls Specs Power Source 12V DC, 300mA per station. Use PS1208UL, or PS