This set of (3) wireless Christmas light power hubs is controlled by a single key chain transmitter that activates the hubs, even through walls or doors. Each hub will operate up to 625 watts of incandescent lighting or 1000 watts of appliances. The total wireless range is 80 feet. This item is a Radio Frequency Device (RF), and as such the range of the remote control is dependent on many factors. Actual operational distance will vary based on walls, line-of-sight obstructions, and other nearby electronic devices. Controller requires a CR2032 battery (included).