A wristband which can signal when someone with autism is experiencing severe anxiety before it triggers dramatic changes in behavior is being trialled in the UK for the first time.
It looks just like a watch and works like a fitness tracker to monitor minute physiological changes in the body.
It's hoped this could transform the lives of people with acute autism - who may be non-verbal.
The device costs £1000. At the moment, the charity Autism Together has three - but would like to add five more to a trial.
Andy Bonner's been finding out more: