This power adaptor/audio unit is truly junk. My motorcycle vibrates the hex head bolt loose frequently which causes the speaker to flip flop. The thing is plastic so you can't torque the nut very heavily or you will break the plastic. The worst part is the horribly engineered power/data pins. If you remove the power plug frequently eventually you will snag a pin end and pull it out of its proper place and voila you are busted and have to shell out over $40 for a new proprietary power plug. A terrible accessory on an otherwise great unit. Unfortunately, this part is a single critical point of failure. Shame shame Garmin.