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One last thing to remember before you buy the Sleep Number is its limited warranty. The manufacturer recommends that customers buy a surge protection with a voltage of 330 volts. It must be listed to UL1449. Also, ensure that the surge protector protects the Sleep Number against damage from power surges. The warranty won't cover repairs costs for two years if it isn't. It is important to review these policies and warranties before purchasing a Sleep Number bed. It offers customizable sleep solutions