12 Lead Interpretative ECG Built-in high resolution printer Graphical LCD Monitor YM412i can store up to 5000 ECGs. Optional Firmware upgrade using USB memory Stick Internal battery provides minimum of 5 hours backup LCD preview of ECG signal appear a false lead and signal noise. Real-time continuous recording capability of 3, 6, 12 channels users selectable Sampling rate of 500Hz and common mode rejection of 100 dB Using Serial Interface ECGs can be transmissed to PC from the machine for ECG Management. Battery Backup 5 Hours