i cant say if any of it works but i dont think its needed...every year fall turkey hunting or squirrell hunting we see tons of deer...many of which have nice nice racks upon their heads...and we are sweating and have blood on our hands....guns smell from being shot and oiled...we just cry out human....and every year them deer are all close...my dad had an 8 pt about to walk on his legs but he jumped at the buck and scared it before he did...i dont think its really needed