A:Answer You’re in just the right place, Rodrigo! We’ve got all the handy tips and advice at your disposal. Now I understand you’d like to use one of our sports watches for swimming. You’re in luck as nearly all of our watches are able to do this. You can purchase the Runner 2, Spark, Runner 3, Spark 3 or the Multisport watch. The only ones you can’t use for swimming is the Runner and our fitness band:TOUCH. Now in terms of finding the cheapest watch, generally speaking the oldest generation retail a little cheaper, so in that case you’d want the first gen which is the Multisport. The next gen is the Spark / Runner 2 and then the third gen is Spark 3/ Runner 3. The prices should increase accordingly. If you’d like to know a bit more about how it works on a first gen watch, see this video: https://us.support.tomtom.com/app/answers/detail/a_id/17539 . If you have any more queries or questions, you know where I am. Apologies for the delay in our initial response.