Omron's A2W wireless switches use a sub-GHz band for reduced interference and better signal propagation to difficult-to-reach areas. They have self-power generation, eliminating battery replacement at the individual switches and enhancing safety and energy saving in the Slave buttons (pushbutton switches). The A2W also have easy visualization of reception status using reception confirmation LEDs on the switch base, and a receiver unit capable of controlling eight switches at one time.