16 HOURS OF RECORDING TIME FOR 128MB MEMORY LCD DISPLAY 300HZ TO 3000HZ OF R/P FREQUENCY RESPONSE MEMORIZE RECORDING DATE OF MESSAGE DISPLAY REMAINING TIME FOR RECORDING MESSAGE OF EACH FOLDER WOULD BE PLAYED FOR 5 SECONDS MICROPHONE JACK HEADPHONE JACK MINI 5PIN USB JACK UNIT SIZE: 113.5 X 28 X 18 MM