The APC 1500 is unfortunately a faulty design. I've already had to retire my first device because it accidentally hung up and stopped supplying power to important devices such as servers and routers. In 365 days without this device, I had 0 power interruptions - the Swiss power grid is extremely stable, which is why a UPS is superfluous here. Today, I will finally retire this device and not replace it. No recommendation to buy!