"By pressing a button on the remote, you set off a spring-loaded hammer that strikes a solid aluminum rod in the device, which then rings out at an ultrasonic frequency. "
"By pressing a button on the remote, you set off a spring-loaded hammer that strikes a solid aluminum rod in the device, which then rings out at an ultrasonic frequency. "
When my friend’s dog would run across the living room the tags on its collar would jingle and change the channel. Sometimes at a very important part of a program we were watching! 🤣