Philips Smart Downlight fits 5-6 inch trim size recessed cans. Philips Smart LED lighting is simple to install and works with your existing Wi-Fi, no extra equipment needed. Simply screw in the bulb, download the free WiZ app, sync the bulbs, and begin using. The app makes it easy to create a comfortable ambience with presets, custom scenes, and dynamic light settings. Enjoy the convenience of wireless dimming. Simply use the app or your voice to adjust light from bright to dim. Wireless control makes it easy to create a comfortable ambience with your smartphone or voice using the WiZ app from anywhere in your home or even when you are away. Compatible with most voice-activated devices from Alexa and Google.