A disc-shaped central unit with a diameter of around 8cm (three inches) houses a tens gel pad, a USB-charged battery, and the control buttons. This slots into a replaceable strip of butterfly-shaped fabric, which, like a large plaster, is sticky on one side, and is said to be good for between 20 and 30 uses before you need to use another one.
https://www.bbc.co.uk/news/business-64397795?at_medium=RSS&at_campaign=KARANGA,
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