Wireless Vent and Filter Boost Remote.Works with Any Redlink 2.0 Thermostat,20/40/60 Minute Ventilation and Filtration Timer.Ventilation and Filtratiion Control From Any Location.Included (1) Lithium Battery,Does Not Require a Ventilator to Boost Filtration.Up to (6) Vent and Filter Boost Remotes Can Be Connected to Each Redlink System.Weight:.15oz, Dims:2-7/8"H X 1-7/8"W X 15/16"D, Made In Mexico, Mfg/Box.