We enjoy the driving pleasure brought by the exhaust sound, but sometimes we are bothered by these noises. This product can help you. When you are driving on the boring open road, press the start button of the remote control, and the loud exhaust sound will bring you driving passion. When you drive home, press the close button of the remote control, and the soft exhaust sound will no longer bother your family and neighbors. Kit includes: 1 set of Remote Control Device and 2 Exhaust Cutout with Muffler Material: stainless steel Size: inlet/outlet 2.5 inch outside diameter Installation method: Welding or clamp quick connection, we strongly recommend professional installation. The battery model of the remote control is 2016 button battery . Each remote control requires two batterys. (Battery does not include) We are full of confidence in the quality of this exhaust cutout with muffler, and are willing to solve any problems about it for you.