Aiphone - LEF-10 10 CALL MASTERAnalog 10 Channel Master Station The LEF 10 is a selective calling open voice style master station with a capacity of up to 11 total stations. Features Supports up to 11 total master, sub, or door stations LED and tone to announce incoming calls Push to talk at calling master station Hands free communication at responding station Selective monitoring Privacy feature prevents unauthorized monitoring Voice and call tone volume controls Selective door