Alright.....I've had a lot of PM's concerning the size of speaker, length of battery time, how it comes off etc. I took it for the team and removed my speaker from my helmet and took some pics.(it takes several putting on/off of the helmet to get the speaker in an optimum spot and I only have one arm to use..the exact reason for this bluetooth for me) now that I'm done crying :'(. On to the pictures....one of the pics is the speaker width- approx 4mm, 4.5 with the Velcro. another pic of installed Mic inside helmet, another pic of outside installed, another with the unit removed. The unit comes with the small Allen wrench to tighten the clamp onto helmet. Only drawback for me is the unit only goes on the left hand side of helmet (picture on box shows it on the right). I'm right handed and have to reach across to the left and it's awkward for me , but I'm getting used to it. I usually don't make calls but am answering them more. You just set your phone for auto answer or you can tap the button on the unit to answer. They made the button pretty much the whole surface of the unit. They kept in mind that we have fat fingers with gloves on. Another question I need to answer- the box says talk time to be 7 hrs talk time and 1 week standby. Another question- weatherproof. AGC technology automatically adjusts volume according to noise and speed levels. VOX technology enables to receive or reject calls by voice control (I haven't used this feature yet). It does have volume up/down. I don't know what this exactly means, but bluetooth version 1.2 (it works with my phone). WOW, that is a write-up. I feel like a salesman ;D..anymore questions, PM me. will be glad to help. MM