This review is somewhat delayed.  The unit comes with a generic cable used to attach it to the vehicles braking system and power.  This cable is for use with a vehicle that does NOT come with a "Factory Equipped Trailer Tow Package".  This is understandable as there must be a zillion different sizes and shapes of tow vehicles.  My vehicle, a Chev 2500 diesel, did come with a towing package.  Consequently I have ordered the correct cable from Hopkins.  Once it arrives, should be a simple process to hook it up and test the braking system.Present observations:Units, there are 3 pieces, look well made.  The display itself is smaller then I expected,  about inch high and a tad wider.The cables will for sure be long enough for just about any placement of the three units. (Control box, display and manual brake control)  They appear to be heavy enough without being stiff so can be routed easily.I'll update this review when the "Tow Package" cable ($7 additional) arrives and is units are installed and tested.UPDATE:  Using the cable Hopkins sent for my vehicle, installation was a 10 minute job.THE UP-SIDE:The cables for the various pieces/parts were long enough, flexible and sturdy.I was easily able to place the LED display, the manual brake control and control box for easy visibility and access.After setup, braking was good.  Worked very well towing my 30 foot double axle travel trailer.THE DOWN SIDE:The LED display is smaller than need be.  It's also not bright enough to be really useful in the sunlight.Unlike my Tekonsha brake controller (which I've reconnected and am using again) the Hopkins unit apparently releases the trailer brakes when at a full stop even though the tow vehicle brakes are activated.  At least the display reverted to zero at each full stop.The display and manual stop units have no provision to permanently  attach them anywhere.  Yes, you might use double sticky tape but that's a temporary measure especially when the truck may get to be 140 degrees inside after sitting all day in 100 degree sunlight.Conclusion:  Hopkins has a great idea here if some minor improvements are made.  A larger,brighter display.  Partial brakes at full stop.  Ways to hard attached all the units.