we all hear different, but what you should be able to hear is. I use AutoCAD 2013 on a HP touchscreen and like the Arc mouse and its touch scroll. I am pleased with those other products. The lights are fine, but not that interesting to me. The length fits well, and if I had sized down, it would have been too small. I even mentioned in the email that this was the first time I bought one of their products and this is a chance for them to build a relationship with what could become a lifelong customer. You need to come up with a software application that can be used to control and direct the 3 cameras either individually or all at once. Great substitute for the original. The upper frequencies in my left ear are not very good, and I experimented with wearing my standard NHS hearing aid. It?s says there is an extra but I was actually short 3.