Wireless switching using a sub-GHz band combines wireless reliability and ease of use. Abilities include utilizing the sub-GHz band for reduced interference and better signal propagation to difficult-to-reach areas, visualization of impedance to wireless transmission because of damage or noise using master unit error output and visualization of slave button reception status using reception confirmation LEDs. Self-power generation eliminates battery replacement and enhances safety and energy-saving in the slave button. Eight outputs focus on decentralized control.