This phone mount fits in the bike's navigation cradle and uses the cradle to power the USB ports on the phone mount so the phone will charge while riding and can be used as the navigation device. It works great, holds the phone securely, attaches to the bike securely, and negates the need for a BMW navi unit. It mounts into the nav cradle in just a few seconds and locks in place just like the nav unit would. I'm only parting with this because I've switched bikes. These are $85 on Amazon. This one is in perfect condition with all hardware and original parts. $40 including shipping in the CONTUS.