When you say ”Hey Siri” near multiple devices that support ”Hey Siri,” the devices use Bluetooth to quickly communicate with each other and determine which one should respond to the request. The device that responds is the one that heard you best or was recently raised or used.

HomePod responds to most Siri requests, even when other devices that support ”Hey Siri” are nearby. To use Siri on a specific device, raise to wake that device or press the button to use Siri, then make your request.