Forerunner® 45S 39mm - Iris

Forerunner® 45S 39mm - Iris


Forerunner 45S is the smaller-sized GPS running watch with all the running-related features you need in a sleek, lightweight smartwatch you’ll want to wear all day and night.

Lens Material

chemically strengthened glass

Strap material


Physical size

39.5 x 39.5 x 11.4 mm

Fits wrists with a circumference of 124-185 mm

Display size 1.04" (26.3 mm) diameter
Display resolution 208 x 208 pixels
Display type sunlight-visible, transflective memory-in-pixel (MIP)

Small: 32 g
Large: 36 g

Battery life Smartwatch Mode: Up to 7 days
GPS mode: Up to 13 hours
Water rating 5 ATM
Color display
Memory/History 200 hours of activity data