The accessory is small (64 x 64 x 64mm) cube shaped subwoofer sporting a 1200 mAH battery that is quoted as being good for 9 hours of playback.
It charges via Micro USB, pairs via Bluetooth or NFC and works within 10 metres of your device.
As you can see from the photos, the bottom slides out allowing you to plonk your device up against it.
The device is designed to work in conjunction with your HTC One with the BoomBass providing the low tones and your One providing the highs through its own BoomSound speakers.
We are being told the release date of the HTC BoomBass is sometime in October. (pricing unknown at this time)
If you play a lot of music through your device this could well a nice accessory for you.
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