... the electricity net disturb, output pure wave, stable voltage and frequency, high precision, light weight, small volume, output use ... distortion: <1%6.Isolation transformer output, safe and credible7.Auto-protection and alarm for output overvoltage, overcurrent, overheat, short ... time<0.1S. 10.Regarding the input/output voltage and frequency, please explain when you purchase.Adaptation range: Railway ...