If you had to take a count of those people who\u00a0 have audio systems \u2014 specifically an amplifier \u2014 in their home theater, it would probably equal less than those who have portable Bluetooth speakers. But a portable is never going to match the power of an audio system, not to mention have speakers anywhere the size or scope. So what do you do when you want to stream audio from your phone or tablet to your home theater but the amp doesn\u2019t have built-in Bluetooth? You gladly spend the $49 and get a ROCKI PLAY.\r\n\r\nSmall and oddly shaped, this little black box can easily blend into the black of any audio receiver. But it doesn\u2019t have to \u2014 a series of soft rubbery \u201cskins\u201d (covers) that push on\/pull off can cover it. This is less to try and match a maroon receiver as it is to be a show off \u2014 greens and reds not found in your average A\/V audio device. ROCKI comes with one skin, others are optional, and you choose the one you want when making the purchase.\r\n\r\nThe ROCKI PLAY is designed to do one thing \u2014 receive a stereo audio signal with all the inherent quality it has and transfer it to an amplifier. The technology inside consists of WiFi (802.11N and lesser frequencies) plus two connections on the back (corresponding to the holes in the skins). One of the connections is a micro-USB for charging the internal battery, with the other being an audio stereo mini-jack output. A number of cables are included such as mini-jack to RCA and mini-jack to mini-jack. Basically this means you can connect the audio output from the ROCKI PLAY to a receiver or powered speaker easily. In my case I went with the RCAs to connect to my Sony receiver. But getting back to that micro-USB, it\u2019s for charging an internal\u00a0 battery that can work for up to 3 hours at a clip (I gave it a recharge at 2 to be safe the first time out). And if it\u2019s plugged into a USB AC adapter (or powered by a USB port on the receiver), then the battery saves its juice until needed. The small indent at the front turns the ROCKI On\/Off and there\u2019s a green LED to remind you that it\u2019s working.\r\n\r\nSending music to the ROCKI PLAY requires an app for Android devices, with the iOS (Apple) app lagging behind to the point of wondering if it is going to come out ever. So since I\u2019ve an iPhone, I connected to the ROCKI directly, configured it through my web browser and then used Airplay to stream the music. Sure an app would be faster, but the main point is that using WiFi means you get a higher resolution of the audio being played \u2014 which is, after all, the reason for wanting to use a receiver and a good pair of speakers instead of some rinky-dink Bluetooth box.\r\n\r\nI gave ROCKI PLAY a good test by playing selections from the MYSTERY GIRL Deluxe CD by Roy Orbison. Anyone familiar with the singer\u2019s voice knows that a low resolution reproduction of the audio sticks out like the proverbial sore thumb. I didn\u2019t suffer any of that \u2014 as the hi-rez versions of A Love So Beautiful and The Only One sounded the same on my audio system using the ROCKI as when I played it directly through my CD player.\u00a0 I know that the company says that through the app there are integrated music services and playlist creation abilities, etc., but all I want\/expect from an audio transmission device is that it works simply and consistently and doesn\u2019t sound like it\u2019s even there, which is what ROCKI PLAY does. And that\u2019s enough.\r\n\r\nBottom line: ROCKI PLAY is portable in that it can fit in a knapsack or jeans pocket, but its great strength is that it doesn\u2019t care what it\u2019s being connected to: as long as there\u2019s an audio input, it\u2019ll stream music.