Product specification Case size (length x width x thickness) 38.8 x 34.9 x 7.8 mm mass 20 g Case / bezel material resin band Resin band Waterproof Waterproof for everyday life Power supply / battery life Battery life: about 3 years Exterior Glass Resin glass Band wearable size 145-205mm Clock function accuracy Average monthly difference: ± 20 seconds