Casio #MQ24-7B/LQ139B-1B Men and Women's Classic Analog Watches Imported Water Resistant 3-Hand Analog Accuracy: +/-20 seconds per month Battery SR621SW, Approx. battery life: 2 years Size of case / total weight: 37.5 x 35.0 x 7.5mm / 19g(MQ24), 30.0 x 24.0 x 7.7mm / 10g(LQ139)