(The battery installed in the watch is a monitor battery used to check the watch's functions and performance battery life will be shorter.). Keep batteries out of reach of children. ・[Size] Case size (length x width x thickness): 50.5 x 50.4 x 13.5 mm strap width: 21 mm (buckle side) - 28 mm (case side) lug width: 18 mm band size: 145 - 215 mm weight: 63 g.