JascoPro Series Add-on Switch. When paired with a smart switch, dimmer or fan control, the hardwired device completes multi-switch systems. It works seamlessly with Wi-Fi, Z-Wave and Zigbee controls from JascoPro Series. Wirelessly operate and schedule indoor or outdoor fixtures from up to five locations for effortless management of your home. Please note, this is not a stand-alone switch. It must be used with a compatible smart device. QuickFit and SimpleWire technologies make installing the switch easier than traditional smart devices. Dual ground connections allow daisy chaining in multi-gang uses. A reduced housing depth and lack of break-off tabs conveniently fit crowded electrical boxes.Unlike traditional three-way switches, add-on switches support the full functions of the connected smart device. Trigger scenes from all locations if capable through the smart control. When used with a dimmer, the add-on switch also allows brightness control. Your smart home does more with the JascoPro Series Add-on Switch.