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The FiberSafe™12 battery is specially designed for use with your AT&T U-verse VoiceSM service and the iNID Power Supply Unit (iPSU). It is a sealed, rechargeable battery that provides battery backup power for your AT&T U-verse Voice service when electrical power to your home is interrupted. FiberSafe12 batteries are manufactured by EnerSys, the global leader in stored energy solutions.

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