This product is a servo motor-type high accuracy household voltage stabilizer.low power consumption.Reliable work.High accuracy of stabilization.Good for use in regions where the net voltage is much fluctuating. Input voltage:AC50V-130V or 160v-250v With over current protector With output voltage indication Output voltage:AC220V/110V+2% With 110V/220V binput votage selector switch modles list as following: SVC500 350N SVC500 500N SVC1000 1000N SVC1500 1500N SVC2000 2000N SVC3000 3000N SVC4000 4000N SVC5000 5000N SVC7500 7500N SVC10000 10000N SVC15000 15000W