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.