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Loading... Please wait...The U.L. Listed Nighthawk Deluxe unit contains the same features as the NH57 plus it is a direct plug, wall mount, and table top unit all in one with 9V back-up. The Consumer Product Safety Commission recommends only detectors that meet U.L. Standard 2034, such as Nighthawk Carbon Monoxide Detectors. You'll know the detector meets rigorous standards of performance, safety and accuracy when you see the U.L. seal on the product. 5 year limited warranty.