This US version Smart ON/OFF Switch is an amazing device. Monitor and control your lighting and small appliances with your smart phone. Connect this Z-Wave switch to your existing 3-way switch, create custom scenes, schedule timed events when you're at home or when you're away. This Wall Mounted Switch is designed to work with other Z-Wave enabled devices. Z-Wave nodes of other types can be added to the system and will also act as repeaters.