Green Air RCI Cell for Ecoquest Fresh Air 2.0 and 2.1 Powerful UVX Bulb For Ecoquest/Vollara Fresh Air 2.0 or 2.1 Not for Ecoquest Fresh Air 1.5 & may not work on older units (8 to 10 years old) with weak transformers Fully pre-tested at time of shipment Long Life expectancy