Compact in size, easy and direct operation, portable Working modes: manual / auto / arrhythmia analysis 112mm, 6channel format recording Accurate automatic interpretation function 320*240 graphic 3.8 inch lcd screen 12 leads synchronously acquisition and display 20patient cases save and replay (extendable) Adapt to 110-230v, 50/60hz power supply Built-in rechargeable ni-mh battery High resolution thermal printing Usb/rs232 interface