The HS210 Smart Switch Kit 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 kit includes 2 smart switches 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 Amazon Echo or Google Assistant voice assistants. Protocols supported: IEEE 802.11b/g/n; System requirement: Android 5.0 or higher, iOS 10 or higher; Wireless type: 2.4GHz 1T1R.