I have contacted Sony Support about this, but want to post on here in case anyone can help!

My Smart Sensor won't turn on!
The power comes on fine when I am charging it, and I am able to sync with my phone whilst it is charging.
When I remove it from the charger, it doesn't respond when I press any of the buttons.
I have tried to reset it by pressing the reset and 'on' button at the same time for 7 seconds, but nothing happened when I did that either.

It had been working fine prior to this issue.

Any help appreciated. I will update this post if I get any response / help from Sony!