I don't know why the specs listed here for the Razor Slim earmuffs say "individual volume controls", there is only one on/off/volume control. These muffs utilize a single volume control which controls left and right volume simultaneously. I just tested the Quad Razor Slim earmuffs, and they appear to be stereophonic. (If you softly rub your finger on the outer case of the right muff, sound is amplified primarily on the right, and the same action with left side produces the same results on the left) That being said, it is difficult to discern from which direction noises are emanating with these muffs. Same as the other Walker's electronic earmuffs with only dual microphones. My Howard Leight Impact Sport electronics muffs do a much better job as far as directional noise locating abilities. But they are less comfortable and the on/off/volume knob feels a little bit sketchy and does not operate as smoothly or conveniently as the Walker's.
I especially enjoy the feature where I can hear regular noises, yet it cancels out any loud, sharp, and unwanted noises. I can barely hear my mother-in-law now. I may wear them every time she visits from now on. Plus, they are very comfortable.
These are a great set of all-around ear protection. Whether I'm on the range, out hunting or taking the kids to a monster truck rally, they always get the job done. Very compact and I love that they amplify sounds so I can talk to people without having to remove them.