Features Twelve channel with interpretive Build in rechargeable Li battery Chinese/English language Simultaneous 12 leads 320X240 graphic LCD, 5.7 inch screen Paper size: 216mmX20/30m Built in RS232 interface (USB is optional) 128 patients save/copy/communication Specification Lead standard 12 leads lead acquisition synchronously 12 leads Data acquisition 18bit/1000Hz Record mode Manual mode; Auto 1; Auto 2; Auto 3 Filter AC, EMG, Drift Filter CMRR 100dB(with AC filter) Input circuit Floating; Protection circuit against Defibrillator effect Input circuit current ≤0.1μA Input Impedance ≥2.5MΩ Patient current leakage <10μA Calibrating voltage 1mV?% Voltage Tolerance ?00mV Time constant >3.2s Frequency response 0.05 ~150Hz Noisy level ≤15μVp-p Sensitivity valve ≤20μV Inter-Channel Interference ≤0.5mm Paper speed 25, 50mm/s(?%) Sensitivity AUTO, 2.5, 5, 10, 20mm/mV Recording mode Thermal Array printing Paper specification 216mmx30m, roll LCD display 320X240 graphic LCD, display status & waveform Safety classification IEC60601-1 class I, type CF Power supply AC : 110V/220V/110~230V, 50/60Hz?Hz; 30VA DC : 14.4V(2000mAh) rechargeable Li-ion battery