Trusted Reviews reviewed the Acoustic Authority iRhythms A-9900 Sound Cancelling Headphones

It's a bit of an over simplification, but broadly speaking digital still cameras and digital video cameras use the same basic technology. They both usually have a CCD image sensor, a compact but powerful zoom lens, electronic systems for autofocus, exposure metering and image processing, and both record the results onto a digital storage medium. In the case of video cameras this is usually digital video tape, while still cameras generally use removable flash memory cards.

Acoustic Authority iRhythms A-9900 Sound Cancelling Headphones Review