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Timer function, can set the on or off time, and can also set the countdown on/off time. There are options for one-way, two-way, three-way, or four-way, which can be selected according to your needs. Can be used in combination with other types of switches or wall sockets. You can remotely control the switch through a mobilephone app, such as turning on the light before arriving home. Compatible with Alexa and Google Assistant, you can easily control the switch through voice commands.