This is a mounting bracket for the Raspberry Pi Sleeve cases. I designed this bracket to be glued to your Pi case, and plugged into a cigarette lighter. The body of the bracket is meant to hold loose wires tightly like a spool.
I designed this for the accessory input panel on my wife's Dodge Grand Caravan. With this, I can mount my Raspberry Pi in the car where it won't get damaged and I can use it to drive the entertainment system in the car.
This is part of a larger project I posted on Instructables.