Sold as 1 Each. | 650VA ultra-compact 120V standby UPS, energy-saving ECO outlets. NEMA 5-15P input plug and 8 NEMA 5-15R outlets. | Audible alarm is muted for full-time silent operation. USB, TEL/DSL protection, Wall mountable, Surge-only outlets. | ECO option turns off set of three outlets when the computer is not in use. | Maintains AC output during power failures, 99% line mode efficiency.