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The new 255 comes in two sizes, a standard 46mm and a smaller 41mm for those with a smaller frame.
The standard 46mm has a 22mm band while the smaller 41mm has a 18mm band width.
Water rating: 5ATM (waterproof and comes with a swim activity to measure laps and strokes)
Battery Life: Up to 12 days (41mm)/ up to 14 days (46mm)
Battery life (GPS only) up to 20 hours(41mm)/ up to 25 hours (46mm)
Battery life for GPS + Music: up to 5.5 hours(41mm)/ up to 6.5 hours (46mm) only available in the Music version here.
Battery life Dual band + all systems, no Music: up to 13 hours(41mm)/ up to 16 hours (46mm)