When I sat tiny the maximum size is 4x4x2cm, this is the bit that goes into the ear apart from that the thickness is .5cm or less. The weight is a minuscule 5grams. The actual ‘stone’ that provides extra charging while on the move is another 32grams. So even when the earpiece is in the stone the total weight in your pocket is 32grams.

Wires? Not needed - simply hook up the Verbatim Audio Cube to your favourite Bluetooth equiped media player and you're away! Bluetooth has migrated from the mobile phone to the media player, although in many cases it is in fact the media player that has migrated to the phone! Either way some very good quality, high capacity media players now come equipped with Bluetooth (with of course the notable exception of the iPod range - come on Apple - catch up!).

The Nio is a Bluetooth solution to put your mind at ease - being presented as you Gadget Guardian! With miniaturisation comes huge benefits of course. Not so long ago your mobile phone was the size of a brick, your 'laptop' required reinforced thighs and your reel-to-reel tape deck wasn't going anywhere. You didn't have to worry too much about someone wandering off with your valuables while you were out and about simply because those valuables weren't with you. Technology moves on.

First something that's so small and light you could forget you are wearing it. In its most compact form it is 8x4x3cm and it weights just 17grams. It works via Bluetooth and like the unit below can be charged by a supplied USB to micro USB cable however this unit is also supplied with a mains charger and an assortment of plug ends for most countries as well as a cigar lighter charger for use in the car.

The body is 4.5x1.5x2cm and the total weight is 11grams. The figure I gave do not include the covered wire hook that sits behind the ear include this and the 4.5cm height can increase to 8cm. It works with almost any Bluetooth phone and is specifically designed for in car use where noise, wind and echo can be problems. During my tests – even with windows wound down – I was able to hear the other party clearly and they never asked me to repeat anything I said.

Very few mobile phones are in fact simply mobile phones these days. Technological progress has lead to that phone in your pocket shrinking in size while vastly expanding functionality. High on the list of roles is that of media player - both for audio and more recently for video. The traditional Bluetooth headset, while suitable for making a phone call, is obviously not up to the task of stereo playback of your favourite music.

The Discovery 925 is a Bluetooth earpiece from Plantronics “signature” range of designer headsets.  The kit consists of the earpiece unit with a medium ear tip already to place.  You also get a small and large ear tip enabling you to match the earpiece with your particular ear size; a leather-clad case for charging and protecting the earpiece when not in use; leads for charging the earpiece via USB or mains; and a small User Manual.

Made almost entirely from aluminium, a new headset has been launched by Bluetrek, a part of the ModeLabs Groups which specialises in mobile phones using new generation technology.  This product is the Metal and it arrives with the claim of being the world’s thinnest and lightest Bluetooth headset.  When you consider that this headset weighs just 5.5 grams with a thickness of 4.2mm, it would be difficult to doubt this claim.

While you may consider a jawbone to be part of your skull, Aliph, a market leader in noise cancelling Bluetooth headsets, prefers to regard the Jawbone (note the capital letter) as “earwear”.  In other words the Jawbone is an ear-piece style headset for hands-free communication when linked to an appropriate Bluetooth-aware device.  Aliph has now upgraded the original product with its replacement being entitled, not surprisingly, Jawbone 2.

The MotoPure H12 from Motorola measures 41 x 18 x 12mm and weighs in at 12g putting roughly in the middle of the pack compared with . It also happens to be exactly the same size abd weight as the Motorola H680 that fared well in my - no coincidence I'm sure! The H12 is well provided with both a small charging cradle and a protective hard case that can also be used as a charge point.

Many would be quite at home on a Christmas tree. I'm very pleased now to review the 'boring' BT4010 from Jabra. Why boring? Well it's resisted the urge of it's erstwhile counterparts to show-off to the world it's ability to dazzle in the visual spectrum and instead limited itself to a small, lower power monochrome LCD display with various symbols to show status.

Motorola have joined the small but growing band of manufacturers providing Bluetooth stereo headsets with their Motorokr S9. As well as being a wireless way of listenning to stereo on your favourite Bluetooth enabled media player, it also includes a microphone so should you be using a phone it'll allow you to make calls.

The Motorokr EQ5 definitely fits into the portable category measuring 115x65x15mm (WxHxD) - almost identical to the iPod Touch. Very easy to slip into a pocket or bag. Build and design quality are both very good with a black fascia and silver trim and this is matched by a pretty good, although bass-light sound. A small but surprisingly stable wire stand folds out from the rear.

This is a single battery operated circular speaker for anything that has either a 3.5mm or 2.5mm output jack. It is described as a 360 degree speaker and that the battery life is stated to be 24 hours so is ideal for a small group to listen round. While it is likely the 'group' would be young people, I found that in a normal room environment this speaker gave plenty of volume from an MP3 player.

Bluetooth Mobile Phone Mate This looks like a stylus and indeed is one, it could also be mistaken for a pen it can hang round your neck but now its real purpose it's a Bluetooth headset there is a perfectly usable earpiece and microphone that can be connected to it and this will work with the rather fussy new iPhone. So providing your phone has Bluetooth V2 you with this gadget now have a hands free phone.

Iqua have a range of Bluetooth headsets - this is the first product that I've reviewed from the company - the iQua 603 SUN Bluetooth headset. Physically this headset is on the larger size measuring 48 x 25 x 12mm (LxWxH) and weights 14g. This extra size accomodates a small solar cell mounted on the outer face of the device. Included in the package are an ear hook, two different ear plugs a charger and a carry strap.

MoGo Laptop Compact Bluetooth USB Adapter I would certainly not advise sneezing near this tiny device or it could easily get lost. My electronic kitchen scales failed to register when I put it on them and they happily weigh as little as a single gram. It is 2cm long but only 1cm of this will protrude once inserted into a USB port. It is a maximum of 1.5cm wide and slightly concave so you can grip it should you ever want to remove it.

It doesn't seem all that long ago since I last reported on the latest announcements from Sony Ericsson. Actually it was just over four months ago - doesn't time seem to fly by or maybe it is as a result of the onward drive to pump out new handsets and accessories by mobile phone companies. This time Sony Ericsson's product announcements cover new handsets, modems, headsets, gaming and a photographic competition.

Following on from jzblue's Bluetooth Headset roundup , it's my turn to review three additional headsets, taking the opportunity to look at the , the and the . published recently Motorola H375 BlueTrek SenSe Motorola H680 Motorola Universal Bluetooth Headset H375 This is a small reasonably unobtrusive bluetooth headset that was not uncomfortable in use.

Jabra BT3030 As the box states 'Music and Talk meets the streets'. This is far more than a basic answer/call unit it can of course do that but it also allows you to increase/decrease volume, move back/forward tracks as well as star and stop. Of course there is also a phone button. The whole thing is a 5.5x3.5x1cm 'dog tag' style unit that comes on a chain to fit round your neck.