SDR series intelligent digital display full automatic AC voltage regulator adopts the international advanced technology and intelligent IC centralized control technology. It has advantages of high efficiency, beautiful appearance and reliable performance and soon. It is controlled by IC to regulate the relays automatically. It with high accuracy output voltage and its voltage display is intuitive. All products have over voltage, delay, over temperature protection and also voltage twoway indication. These high performance products are specialized for user of unstable voltage and precision electronic instruments and equipments.