La description

 Simultaneous *2 leads ECG acquisition and display
 Simultaneous 3 leads ECG printing with *0mm thermal paper
 7 inch **0 x **0 TFT color LCD
 Alpha-numeric keyboard
 Built-in rechargeable lithium battery (print up to ***0 ECG reports)
 Built-in 4G SD card, save up to *0,**0 ECG reports in XML format
 Pacemaker detection
 Precise ECG auto-interpretation program
 USB slave port can be connected to PC-ECG software
 USB master port can be connected to an external USB printer supporting PCL6 language
 Network transmission
 Software upgrade automatically via SD card