Philips Hue Personal Wireless Lighting, Single Bulb, Retail Works with Alexa for voice control (hub required, Alexa device and hub sold separately). Note: some used bulbs may require a Hue Bridge or a Hue Smart dimmer switch to be reset to factory settings. Automate your lighting experience with Philips Hue and control your lights from home or away. Create light schedules from the Philips Hue App and never come home to a dark house. Requiring the Philips Hue Bridge (sold separately) for the full Hue experience, these bulbs fit standard-size floor and table lamps. Install the LED light as you would install ordinary bulbs and pair them with the Hue Bridge, which allows you to control smart-bulb-equipped lamps and overhead lights via the Philips Hue App. Includes one A19 add-on bulb, starter pack required Control up to 50 bulbs on a single bridge Create lighting scenes based on your favorite photos Controllable lighting from your smart phone or tablet Ships in Certified Frustration-Free Packaging