"Does this device have an internal speaker?"に関する回答No it doesn't, the reason is because this device is intend to connect to tradicional audio equipment serving as an interface to the streaming technology used by many cellphones, tablets an so on. The SONOS connect has RCA connectors for stereo analog audio (input and output), and a optical digital audio output, the outputs can feed a traditional audio amplifier and the analog RCA audio input is intended to feed a bypass audio signal thru it. It has two ethernet 1Gb ports and a WiFi connection that can be configured to receive a wireless streaming inside a wireless network coverage. On the front of the device we can find the basic volume -/+ and mute buttons, those pretend to serve as a manual direct control even if you are using a streaming device to control it, this is a very convenient feature because you can program a playlist on your computer an use the volume control directly on the SONOS device.