Philips Hue Smart Tap Switch (Compatible with Amazon Alexa Apple HomeKit and Google Assistant) Works with Alexa for voice control (hub required, Alexa device and hub sold separately). Remotely recall your four favorite Philips Hue light scenes at the press of a button. Select from your own scenes, scenes created by Philips, or program a button to switch all lights off. Requiring the Hue Bridge (sold separately) for the full Hue experience, this switch does not need batteries. It uses kinetic energy and is powered by your touch. Mount the Hue Tap anywhere with the included mounting plate, or detach it and carry it with you as you move through your home. Add up to 12 other Hue accessories (sold separately) such as the Hue Dimmer Switch or Hue Motion Sensor. Control by voice with Amazon Alexa, Apple HomeKit, and Google Assistant.