Wonderful accessory to my Motorola walkie's!  I've had them years but needed a replacement because I lost one, not because it broke.  It's taken a beating with exposure to snow while I ski.  One thing not documented is that the voice quality depends on the sender's walkie volume setting.  If the sender has the volume set really high, their voice comes across very garbled, so they have to turn it down a bit.  Also, when talking, don't put the mic right up to your mouth.  These tips are true when both using the mic and when not.