If it has an "s" on the end it has a sounder.
If it has an "xs" on the end, it will have then new CHIRP technology.
In the US, they offer a 740 and 720. The only difference is that the 740 comes with preloaded Bluechart maps...I was always told, get the 720, and buy the map card as they are better than the maps than come with the 740.
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