Bonus: At 15 minutes, we show how we adjust gain on a brake controller. About 30% of the SUV's and trucks don't have a factory brake controller. It's all about safe trailering, controlling sway, mountain curves, snow and rain means you need to brake the trailer without the truck to avoid dangerous trailer sway. Curt Echo is easy to install, just plug it in your truck and plug the trailer into it. It works off your smart phone. We demonstrate is with my Apple 13 Pro. Just sync your phone to the Echo with the code that comes with the Echo so you're only controlling your trailer and no one else is controlling yours. In your phone app, you set the profile for up to 5 trailers. Set the gain and sensitivity for each trailer profile. There is a big orange button on the phone app to brake just your trailer and stop road sway. The Echo has a 3-axis motion sensing accelerometer for control. No tools install, just takes 15 minutes and you're ready for safe trailering. It securely attaches to your factory trailer plug on most SUV's and trucks. https://www.curtmfg.com/dm/echo-mobil... #Trailering #MrTruckReview, blue tooth phone trailer brake controller, wireless brake controller, curt echo wireless brake controller