TEMPEST Electronic Intelligence.
--CLEARNET WARNING--
https://irp.fas.org/eprint/tempest.htm
Your computer hardware including your monitor and keyboard are most likely succeptible to TEMPEST ELINT attacks due to the stray electromagnetic energy they radiate. And I have read that a close range detector is nothing too sophisticated or expensive and a state entity can deploy a listening post from a km away!
Unfortunately, there exists no consumer standards for TEMPEST compliant devices. I even wrote to my local representitive about it.