Electric waves: cheap, energy efficient Bluetooth replacement

https://techxplore.com/news/2023-11-bluetooth-scientists-efficient-transmit-devices.html

"improved battery life... wearable devices... instead of electromagnetic waves, for low-power data transmission at close range while maintaining the high throughput needed for multimedia applications... phone numbers exchanged simply by shaking hands, or door unlocked just by touching the handle... single chip, and cost just a few pence per device"