Generally, it works fine. Decent range and acceptable sound quality. There are, however, some issues with it:
- The battery cover won't close if using rechargeable batteries, as they are a bit larger than regular batteries. With rechargeable batteries, you have to keep the cover open.
- It needs a high input level. The line output from my Scarlett 2i4 was too low to be usable, so I had to use the headphone output instead.
- Unsure if the limiter works. I've tried triggering the limiter, but the "limiter" sign never comes on, and I certainly don't hear it in the headphones.
- Not much of a squelch. Make sure to turn the receiver off first, then the transmitter. Otherwise, you'll get really loud noise from the iems.
And now a note about 863 mHz devices. Some of the frequencies used by this product are also used in consumer wireless headphones and such. This makes it somewhat compatible with other products you may have at home, but you may also hear your neighbour's TV on your iem.