BBC Clickâs Nick Kwek goes into sub-zero temperatures to test a wristband that can warm you up.
The Embr Wave wristband is said to act like a personal air conditioning unit using a thermal electric module to that acts like a heater.
The manufacturers say it can vary your body temperature by up to five degrees. Nick puts it to the test in a cold environment and then in a hot tub.
Read and watch all our CES coverage at bbc.com/ces2019
More at BBC.com/Click and @BBCClick.
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