The HS210 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 switches specially designed to work together with 3 way switch wiring. Theres no need to be an expert on complex 3 way switch wiring or confusing master vs auxiliary switch settings. The 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 or Google Assistant voice assistants. Protocols supported: IEEE 802.11b/g/n; System requirement: Android 4.1 or higher iOS 9.0 or higher; Wireless type: 2.4GHz 1T1R.