SONOFF DUALR3 takes your home to the next level. DUALR3 is a flush-mounted Wi-Fi smart dual relay switch module that is installed behind any standard switch to transfer it into a smart switch for wireless remote control with mobile devices or voice command. Unifying your home appliances into an integrated wireless network to make them communicate with one another which is convenient for you to manage and control, including lights, home appliances and motorized facilities like roller shutters, window shades, blinds, awning, etc. Its TUV certified that provides a reliable quantity and advanced safety, without having to worry about the potential risk of fire and overheat.Three working modes available. DUALR3 comes with switch mode, motor mode and meter mode. One of the typical features is roller shutter and window shades smart control in the motor mode. The switch module offers the ultimate flexibility for your roller shutter and window shades by app remote control and scheduling timed events no matter whether you are home or away.Double two-way control. The double relay switch module distributes the load to two inputs compared to the simple relay, which this working mechanism lets you have two-way control for two devices independently.Power metering. Whats more, the module has an energy monitoring function that can be used to determine the exact energy consumption of the connected devices. In this mode, the load of electrical appliances connected with DUALR3 will always remain on and its relay status will not be changed on the app or the extra switch, used for power tracking and metering only.Powerful compatibility. In eWeLink app, you can manage your roller shutter to make it open, close and even stop at a certain position that you want. Designed to work with more switch types like the momentary switch, rocker switch, ON/OFF switch, dual momentary switch and ON/OFF/ON switch and then you can control your home appliances or motorized devices via the extra wall switch.Siri voice control. By setting up Siri shortcut in eWeLink that allows you to control your curtains with your voice. Even you can create a smart scene to make it keep linkage with other devices in your home, for example, ask Siri to close the curtain to trigger L1 Lite light strip on for an immersive movie night at home.NOTE: This link is for 1-20pcs combination of DUALR3, please confirm before purchase. DIY Your Automated Motorized Facilities DUALR3 can operate as a smart control module for 100-240V motors. Like tubular motor used in motorized curtains, blinds, roller shutter, awning, etc.