Professional regulated DC switching power supply with high quality. Current and voltage are adjustable continuously, coarse and fine knobs for precise adjustment. Input voltage is switchable(AC110V/AC220V) through the switch on the back of the instrument. Automatically switch constant voltage and constant current mode. PWM switch design, highly efficient. This power supply has a close performance to liner power supply, but its efficiency is much higher than liner power supply. 3 digits LCD display of voltage and current, with back light, it is convenient to read. Current limiting protection, current limit can be set freely. Intelligent temperature control fan for heat dissipation, low noise. Low ripple, small size, light weight. Applied in production line test, electrical maintenance, aging products, battery charging, laboratories, scientific research and teaching and many other areas.