Bought to use with an older device and my wired headphones. They do their job. Easy pairing, no connection error and easy operation. I walked around the office without losing connection. Three cons: 1) The build quality could be better. They feel very fragile at both connection points, so be careful when using the charging port and 3.5mm jack. 2) I also wish it had longer battery life. I get maybe 4 hours before I need a charge. The good news is that it only takes about 30-40 minutes to charge, so that's a big plus. 3) the volume of the voice prompts (power on, connect, low battery, goodbye) to FULL VOLUME. To my regret my battery died in the middle of the video. So DO NOT turn on the headphones or turn up the volume, no matter where you set this when turning it on or off. This will scare you. Aside from #3, the only major annoyance, the adapter works fine. Again, for the $9.99 that comes with Revain Prime, you can't go wrong with a simple adapter. Even if it eventually breaks, its replacement is so cheap that I would buy it again.
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