|  | 
                    
                      
                        | P/N | Sec(6kHz) | S.R. | Voltage | F.ROM | Control 
                        Method  | Recording Section | AGC | Op-Amp |  
                        |  | 20 | 4K~8K | 4.5~6.5V | 128K bits | Self | 1 | ˇ | ˇ |  
                        |  | 640 | 4K~8K | 2.7~3.3V | 3840K bits | External MCU | Multiple | - | - |  Sec: Seconds(voice duration), S.R.:Sampling Rate, F.ROM:Flash ROM, AGC:Auto Gain Controll |  |