500W ac power source 50hz to 60hz frequency converter Model: LW-500W Capacity :500VA Output current limit: L:4.5A H:2.3A Size: 430x420x185 (mm) Input voltage: Single phrase 220V±10%/50Hz±5Hz Output voltage: Low:0-150V High:0-300V Output frequency: 45-70/50/60/100/200/400Hz Voltage stability ≤1% Frequency stability ≤0.01% Load stability ≤0.5% Waveform distortion ≤2% @Pure resistance under the load test Efficiency ≥85% @ under full load test Protection function :Over voltage, over current, over load, over temperature protection and warning device Display: 4 digital LED for the voltate,current,power,frequency Cooling way: Forced cooling Working condition Temperature: -10-40℃ humidity﹤90%