Changes are very slight.
The 5600:
Multiband 5
60-minute timer
Stoppfuntion 5sec. Down counter.
The 5610:
Multiband 6 (a radio mast for timekeeping came about, but concerns not Germany)
24 hours timer
Runterzählfunktion no longer (an alternative would be to scream !! LOS and dan simultaneously start the stopwatch;))
Otherwise, I no changes are noticed, except that the packaging and the box of G is black and small. But I like it.
For the clock has already reported enough, you should read thoroughly before wearing the user manual, because there are many cool things you can do with the clock.
Not wearing someone the clock five years, do not know which one turns his wrist and automatically regards light.
Every full hour a signal sounds.
Timer function and so on.
The bracelet is not '' plastic '' but made of natural resin, which also suppresses sweat.
For me there is no better clock, I mean ... let the clock of ner bridge fall and let ne Rolex from the bridge fall ...
And who goes swimming with ner Rolex, may have the misfortune to go down xD
Would I buy it again, I've already: D So have fun with it, I hope could help.