The most popular UV Light system in the world because of its reliability, ease of installation, innovative features, and quality components Includes 1 year effective life UV-C lamp produces UV light in 254 NM UV-C band EPA Establishment # 75179-FL-2 Must be installed by a licensed contractor Made in USA Treats the air all the time and is virtually maintenance free (UV lamp replacement only) Indication light on the device EPA Establishment # 75179-FL-2 Blue-Tube UV is the original award-winning patented non-ozone UV light kit for residential HVAC systems. Blue-Tube UV was the first low-voltage UV system and is the best-selling such product in the world. TUV-BTST comes with a 110/277 VAC power supply and a 1 year lamp.