Good quality materials and design. Compressor fills tank to 120 psi and shuts off and that’s good for several long blasts. It takes a little while to recharge the tank but shouldn’t be a problem unless you’re installing on an actual train :)To reduce how loud the blasts are ( and they are LOUD), I bought a cheap small air regulator used on spray guns to set the pressure to the horns at 40 psi. Still plenty loud but a lot nicer tone and saves more air in the tank.Not much in the way of instructions so you might need help installing and plumbing it in.