[TeMPOraL]

> Think window break and door lock sensors, etc.

A fun tech I had in my hands once that I haven't seen being use anywhere is turning kinetic energy into power. I've played with a light switch that can generate enough energy from you just pressing them, that they can boot up an internal uC, a radio, and then send a signal. The device had a typical home-automation range of several meters. I've been told that there are versions mounted into window handles, etc.