Bought 2 of these - so I could safely talk with my partner.
Connects really well, compact (virtually invisible to passers by), good battery...and of course looks good being Sony... but we just can't hear each other! Infact NOONE can hear me clearly - the same with my partner (mobiles & landlines alike). You lean further and further forward, shout louder and louder and then have to give up. Max speaker volume too low too!
We both have given up and reverted to head sets. I just don't understand the good reviews. In my opinion, they're rubbish. Saw the product on an Amazon email with 5 stars and had to write my first ever online comment!
If you're going to go for one, I'd buy it from somewhere you can take it back to easily if you're not happy.
You may pay a few more quid, but better than wasting £33.
Maybe we just got two duff ones...
Rant over.... good luck!