We are offering ecg machine- 12. Features: compact in size, easy and direct operation, portable accurate pace pulse identification and automatic analysis function four working modes: manual auto physical examination storage 12 leads simultaneous waveforms display 800 x480 graphic 7 inch color screen with alphabet keyboard for input 15mm, 12 channle a4 format recording built-in usb, rs232 interface, computer software optional adapt to 110-230v, 5060hz ac power supply, advanced [freeze] function built-in rechargeable li-ion battery