FoxPro FX3 or Extreme Dimensions Predator Extreme Pro. I made a unit my self that has taken 50 dogs and 13 cats. I used an iPod downloaded with up to 400 sounds if you want but i have my 10 favs. I know about electronics and wired a speaker that is up to 130 decibals to the player. it is tough to do this but with the tools and and time a great unit that extremely light come out. good luck.