main features:4.3inch 480x272 color graphic lcd displaythree channel ecg machine with interpretation 12-lead ecg simultaneous acquisition multiple operation modes: manual/auto/arrhythmia analysis modes 80mm 3-channel recording with a rhythm lead digital filters eliminate emg, ac, baseline drift interference built in rechargeable li-ion battery, 3 hours continuous working adapt 110-240v, 50/60hz ac power supply 250 patients save/replay built in usb/rs232 interface.