The HS210 smart switch makes it easy to replace traditional 3 way switches commonly found in living rooms, halls, or stairways where 2 switches control the same light. The HS210 includes one smart switch specially designed to work together with 3 way switch wiring. There’s no need to be an expert on complex 3 way switch, wiring or confusing master vs auxiliary smart switch settings. The Kasa app guides you through each step of the installation, connecting to your home Wi-Fi, and providing control from anywhere. For convenient hands free controls it easily connects with echo or Google home voice assistants. Protocols supported: IEEE 802. 11b/g/n; Wireless type: 2.4 GHz 1T1R.