If you don't mind spending a bit more $, get this:
It goes for about $300 however it modulates the braking rather than just going to a set value, based on your deceleration rate. No wiring, just install the module on your trailer and plug the controller into your cig lighter.
I had other versions but this is by far the most responsive to mountain driving. I am pulling an Airstream with a 2013 Tacoma. It really saves your trailer brakes because when you are just slowing a bit it barely uses the trailer brakes. If you have to make an emergency stop, it brakes accordingly.
I have had the other type and this is best, plus you can tow with another vehicle by just taking the controller with you, no wiring.
Good luck, Terry
KA7TLT - TLCA 13015
"78" FJ-40 - "Marmot" F&R ARB Lockers, OME Suspension, MAF Shackle Rev Kit, 4+ Flip Kit, Rear Disc Brakes, Warn Winch, Safari Snorkel, 4+ Rear bumper/Tire Carrier
"95" FZJ-80 - "White Top" F&R ARB Lockers, Slee F&R Bumper & Sliders, Warn Winch, 35s, Safari Snorkel, Low Range Gears, P/T Kit
"13" Taco 4X4 Extra Cab, Firestone Air Ride, Airstream tow vehicle - "Daily Driver"