I have no idea, I know there are soem new ones that ahve the sound built right in, they asre supposed to be ok but really pricy, I just made my own,I used a tool box bought a coupel horn spekers got a old tape player and use a motercycly battery I charge up every night after use!!Peopel laugh at it but it last longer than anyone has around here, plusit sounds louder, I have had tons of guys borrow it for geese couse it is so much louder than there own electronic factory ones!! I keek the battery rapped in insulation and tin foil to keep the heat in and have used it for all day long in -35-40 degree weather!! I am sure jcwa will be able to help with the electronic calls better!!I only use mine on windy days I need to reahc otu farther, I ahve 10 times better luck with mouth calls!!


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