The Dahua PFM3350-1500 is a professional 1500VA/900W line-interactive UPS designed to provide stable backup power for networking equipment, security systems, computers, storage devices, and other critical electronics. Its wide 170–280 VAC input range helps accommodate fluctuations in the electrical grid, while digital voltage stabilization automatically adjusts the output voltage. The UPS features a built-in lead-acid battery system with 2 × 7Ah batteries, providing backup power during mains interruptions. Charging to approximately 90% capacity takes 4–6 hours, while the typical transfer time of 4–8 ms helps maintain power continuity when switching to battery operation. For connected equipment, the PFM3350-1500 provides 230V AC output, four European-standard output sockets, and protection against overload, battery overcharge, and over-discharge. It operates without a built-in fan, helping keep acoustic noise low in offices and equipment rooms.