.High accuracy digital filter, automatic baseline adjustment .5 inch screen brings accurate diagnostic display and efficient operation .USB / UART ports support USB storage .Adapt to 110-230V,50/60Hz power supply Built-in rechargeable Li-ion battery .Standard 12 leads,3 channel .AC Filter: 50Hz/60Hz EMG Filter:25Hz/45Hz   Anti-Drift Filter: 0.15Hz(adaptive)   .Dimension/Weight :300mmx230mmx72mm,2.8kgs