The VI 850SE LCD/IEC UPS Line-Interactive 850VA 480W with 4 IEC Sockets from Powerwalker is a Tower UPS. It has 4 IEC sockets (like those of computer power supplies) as well as a socket and output for an ethernet cable and a telephone cable, protecting the devices connected to it, such as a router or telephone (provided their power is also connected to a UPS or surge protector). Its operation is (VI) Line-Interactive, which continuously adjusts the output voltage through an automatic voltage regulator, protecting against voltage fluctuations and power outages. It provides clean sine wave power, which is suitable for sensitive devices (e.g. medical equipment) and is preferred for devices with power supplies that have active PFC protection (e.g. computers).