Back in the mid-80's the VA gave me two sets of CROS hearing aids. This was when I worked indoors for a couple hours then drove a truck with the door open (in all weather). You couldn't use them indoors if there were fluorescent lights because there was no radiation filtering. They just buzzed. They weren't much use outdoors because if there was wind/car air-flow, they'd whistle. But they're really great for watching TV!
...Until they're not...
