I bought the 2.5mm single pin version for my MR350R radios. I also have official/OEM Motorola headphones but was looking for something more comfortable. The sound quality was so bad that it was almost impossible to use. Noise and clicks (when receiving or ending a transmission) were too loud even on the lowest volume setting. And voices were muffled and quiet even at medium to high volume, but at medium volume the tones, clicks and hiss were unbearably loud. Both headphones had the same problem and I tried them on 3 different radios with the same result. As I mentioned earlier, I have OEM headphones that have a clear voice and don't have this volume issue. I ended up returning the commixc because they didn't work for me. I'm willing to give them 2 stars because the ear tips came with 3 different sized silicone tips plus an extra piece that fits over the ear to keep it in place. I was able to get a secure and comfortable fit, I just couldn't get any usable sound out of them.
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