I should note that I will literally only use these for working out which includes running and indoor bike riding on a trainer. I like the sandals but they are definitely not made for walking. When opening the package I was surprised and have an extra item as well. Then 2 weeks later they responded back with nothing relevant to what previously happened. The Winbridge Wireless PA kit comes with everything needed for a portable PA system. As a bonus they actually look very trendy. These were a great replacement for the original ibeats. I do wish there was an easier way to install it, as it was very difficult to get a drill in the space of the rack to drill through the hole. The basic configuration is for 2 bikes or 4 bikes. I dont like wearing them for more than a few hours, they make my inner ear itch.