Sound is just ok, fairly clear with some static. the worst part is that they are very difficult staying on your ear, took some time to get them to initially stay on ear but when moving up/down field they would move around and occasionally fall off.We use this intercom system for communication on our boat when anchoring , docking or any other activities when we must be in separate areas of the boat. The light weight, voice activation is Wonderful. The instructions could be a bit clearer, but once you play with it to figure out how it works it is Great. Strongly Recommend.Works well and good quality. Can only be used on left ear which is a little bit of a limitDespite what some people are saying it is adjustable to both ears just requires some finessing to switch between ears.Haven't had chance to use yet but looks perfect for umpiring field hockeyLove itThis was exactly what I was looking for. I love themLooks good but unfortunately it came in broken.Use a hat or medical tape to stick it to your ear. It can fall out during football or hockey matches though I'm not sure about American football. Do the American football. referees run during a match?The mic doesn't work as it should when I receive calls my friends say that my voice is really far and they can barely hear me talkingDoes not fit perfectly and volume keeps going down in itWas very excited about this product and thought that it would fix my "not hearing anything while driving my bike" issue... well.... I could hear, the mike DID NOT WORK!!!omg...is there a system that works out there?I have always been a need for a headset that does not connect to a helmet, and I only saw this product on the Amazon. But the ranking was very poor, which made me hesitate to buy it. After using it, I found that it can fit with my Vnetphone v6 together perfectly. If you have a Vnetphone V6 don't hesitate. This is not a product designed for helmets.