Can be used with AC /DC, 220v, 50Hz. Auto detecting battery voltage, auto shut down when low power, low power indication, battery auto charging Calibration with key ( locked in software and hardware )+ instruction, manual user. Auto zero tracking. Full range tare function Dual display panel at operator and customer side Adjustable feet, rechargeable battery Stainless steel Cover and power adaptor included Calculated according to A/D internal counts, have high A/D resolution