and by the way shamoot,immitation is the greatest form of flattery,and unless there is someone giving foxpro the schematics of the electronics components and circuitry then fox pro is only using the case design.PS I'm sorry if I used to many big words you may not understand.schematics are like blueprints for electronics.components are the electronic parts used.circuitry is the actual wiring and boards that carry the current that when broken down into different frequencies makes the speaker vibrate at different rates of speed,that causes the sounds that make coyotes come and dogs bark.I thought I would break this down for you so you could understand,since you may be not as intelligent as some others,since you jumped on this forum and started running down stuff that you may or may not know about,we like to use this sight for sharing experiences and enjoying the great outdoors not starting crap,I have owned several different brand calls and I will not run any of them down due to design if they work good they work,thats the main thing.My foxpro works,my prey master worked,my extreme dimensions works,I only own the FX3 now but the others were great and I will tell everybody to try them and buy what suits them the best and maniska is probably a great little caller I tell them that also,just enjoy this site,you are online with people that enjoy the sport of hunting and fishing,and that dont usually critisize other peoples choices or advertise only what they like.