Wal Mart has manufacturers make some products that are "dumbed down" than products you will find at other retail stores. They do this in orderto maintain low prices. They dont do it on everything im not sure if these amps are an example. ex. Years ago i had bought a paintball gun a spyder imagine online and payed 230 for it, later i saw the gun at walmart for 140 and i was pissed untill i picked it up and looked at it. The gun looked the same but it had less burst firing options , it didnt have the laser eyes the prevent from breaking paint and the gun had a different bolt system that was less efficent than the one in my gun.