Mark event (openning eyes, closing eyes and flashing), using different colors stands different event. Color of background and waveform occurred by different event is adjustable. Using bioelectricity amplifier brainwave, extraction of 24 hours, integrated automatic calibration system. Multifunctional flashlight of USB port, manual control or automatic control). 10/20 electrode placement method under international standard system , can change leads ways while replaying , electrode connection mode can be set at will. Consecutive and Rolling replaying model is supported. It is adjustable for the amplitude and replaying rate. The special vertical time line which marks the collecting time. It divides the waveform in one second into 5 parts and easy for the doctors to analyze the waveform. The multifunctional digital filter system, which has the function of setting up different filters and filtering methods.