The Smart 3-Way Light Switch can be installed for 3-way or single poles to control the light from 1 or 2 locations. Replace one of your traditional 3-way switches with the 3-way smart switch or use directly 3-way switches to control the light from 2 locations. Make your light bulbs smart and control your light from anywhere with this switch's app and voice control function. Featuring a schedule, this light switch removes your worry about forgetting to turn off your devices. You can set schedules or countdowns to automate your home lighting based on your daily routines. A 3-way switch must be installed with a live wire (in front of the regular switch).