This device is configured to allow power from the main source to flow through it and it switches over to auxiliary or battery backup whenever regular power fails. The device also ensures the voltage being supplied to electronics is constant at all times. The device kicks in and supplies power from its batteries when the power supply from the main line fluctuates or drops to unaccepted levels. The device resumes normal mains supply once the fluctuation, spike or sag has passed or stabilized.
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