The PRO Gold voltage stabilizer extends the life of the battery and alternator, improves the efficiency of all electrical devices in the car, improves the power of the ignition spark, prevents fluctuations in speed when the current is suddenly consumed (e.g. when the fan is switched on), increases the power of the car. PRO Gold voltage stabilizer extends the life of the battery and alternator, improves the efficiency of all electrical devices in the car, improves the power of the ignition spark, prevents speed fluctuations in the event of sudden power consumption (e.g. when the fan is switched on), increases the power of the car.