Cordless Sonic Cleaner
I purchased this item from http://www.aliexpress.com for £3.40.
The item took 18 days to be delivered to the UK from China, which is about the average time. The item came boxed (see above) and in a padded envelope. The unit measures about 3.5 inches square and is made of hard plastic. It requires two AA batteries, not included in the pack. There are no instructions in the box but the seller provides instructions on the product page.
The unit can be used with water or without and vibrates at around 5800 waves per minute. It can clean jewellery, dentures, ornaments and braces.
There is an on/off switch on the rear of the unit.
I have tried this unit with one of my wife’s ring in water and it did appear cleaner than before but not where I would step back in awe at how bright it made the ring!
Although this unit is cheap enough, I’m not sure that it works that well.
More info here: http://bit.ly/2yJuaBR