Works with Alexa for voice control (hub required and included, Alexa device sold separately) Enhance your home with soft white lighting, controlled remotely wherever you are. Automate your lighting experience with the Philips Hue App, and ensure you never come home to a dark house Each kit contains 4 Philips Hue White A19 60W Energy Star Certified LED Smart bulbs (able to fit most lamps, overhead lights, and 4-inch recessed cans ); Philips Hue Hub that can reliably control up to 50 Hue lights without slowing your WiFi; three-year warrantee To install, simply screw the smart bulbs into your desired light location, download the Hue mobile app and pair your Hue Hub. Control smart-bulb-equipped lamps and overhead lights via the Philips Hue App Light appearance: 2700 kelvin . Easily expand your lighting system with accessories (sold separately), such as a Hue Dimmer Switch, Hue Tap, or Hue Motion Sensor Philips Hue White Smart Bulb Starter Kit (4 A19 Bulbs and 1 Bridge, Compatible with Amazon Alexa, Apple HomeKit and Google Assistant)