Clear explanations aren't a strength of the Trust BT-9300 Wireless PC Audio System. The box is clear enough, promising that using the device you can send music from your PC to the likes of your stereo wirelessly, but the accompanying imagery gives little clue as to how you do so. Open the box up and a single sheet of A4 paper, replete with over-darkened illustrations, is your only clue as to getting the firm's latest box of tricks up and running.

Fortunately one box pledge proves true, and that's the fact that it's a straight plug and play device, with no drivers required. It means that, in spite of the lack of clarity of the instructions, it's hard to take a wrong step.

Basically, inside the box you get a black wireless music box, of a size slightly larger than a pack of cards. You also get a USB bluetooth dongle to attach to a host PC, and a paper-thin remote control which, if you split it open, no doubt has ‘cheap' emblazoned throughout the middle of it. You also get a 3.5mm audio output cable and the mains power connector that the music box demands.

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To set the unit up, you first need to connect it up to the power (there's no battery option, so it'll always need a plug socket of its own), and then you connect it to a separate hi-fi, speakers or music centre. Then it's in with the Bluetooth dongle and, a quick synchronisation between that and the device later, you're ready to go.

We therefore booted up Windows Media Player and sorted out some music. But in spite of being able to control the playback of the music on the PC from the wireless box itself, we couldn't get any sound coming out of our speakers.

Undeterred, we hooked the box up to a different set of speakers, only to be again met with silence. It's curious: there's clear wireless communication between Media Player and the box, but the final stage - the sending of sound to our speakers - simply stopped things stone dead. We then tried switching the whole set-up to another machine with an earlier version of Media Player, and once again all the hardware was - as promised - detected with ease. But no matter what we tried, we couldn't get a peep from our test machines to any of our speakers.

And that's where the documentation fell down. It's feasible that there's a very simple explanation to this, but the lack of anything to refer to in the box proved to be a major problem. It didn't help that the brief support document on the Trust Web site was no help either.

It's perfectly possible that the Trust BT-9300 Wireless PC Audio System is a fine product. But, due to a cheap packaging decision and under-written support, we're unlikely to find out.

Whatever merits this product may have, the damning verdict for us is simple: it didn't work, no matter what we tried.