The APC BACK-UPS 550 is a reliable uninterruptible power supply (UPS) designed to protect desktop computers, networking equipment, and home electronics from power interruptions, surges, and voltage fluctuations. It provides battery backup power during outages and safeguards devices from unexpected shutdowns, data loss, and hardware damage. Key Features: - 550VA / 330W power capacity: Supports multiple devices including PCs, modems, routers, and external drives - Automatic Voltage Regulation (AVR): Stabilizes voltage fluctuations without switching to battery, extending battery life and protecting connected equipment - Battery backup during outages: Provides enough runtime to save work, safely shut down devices, or keep essential equipment running - Surge and spike protection: Protects connected devices from damaging power surges and spikes - LED status indicators and audible alarms: Clearly indicate power conditions, battery status, and alerts for overloads or failures