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Back-UPS ES 550VA Tower UPS offers best value for protecting your home and home office computer systems. Completely redesigned to use less power during normal operation. It also safeguards your equipment from damaging surges and spikes that travel along your utility and data lines. Features like an audible alarm, LED status indicator, user replaceable battery, push-button circuit breaker and transformer-block spaced outlets make the Back-UPS ES 550VA Tower UPS the perfect unit to protect your productivity from the constant threat of power outages and lost data.