The APC Back-UPS Pro UPS systems provide battery backup and surge protection. Ideal for your home, home office, or small business. The new Back-UPS Pro models are equipped with premium features, including increased runtime and power for your critical electronics. They reserve capacity and runtime for connected devices that need to switch to UPS battery operation in an emergency; less critical devices are only protected from surges. Extends the lifespan and runtime of batteries by correcting undervoltages without discharging the battery.