Harvesting energy from a WiFi signal sounds like something out of a science fiction movie.
However, this is exactly the kind of physics powering former science minister Lord Paul Drayson's plans to tackle climate change and rising air pollution levels.
CleanSpace Tag monitors air quality, analysing levels of carbon monoxide in your air space.
The sensor is powered by technology known as Freevolt, which harvests energy from surrounding WiFi signals.
Lord Drayson sat down and told us how this incredible technology could help each of us make a difference in the fight against climate change.
So, how does Freevolt work?
Harvesting energy from radio signals is not a new concept. How does your work build on what NASA has already done?
What happens when you lose WiFi signal?
How could Freevolt power wearable devices?
And finally, how does this technology help each of us to tackle climate change individually?