Precidrive - This innovative technology ensures the utmost accuracy at Certina. The timepieces with Precidrive, quartz movements achieve real chronometer precision. With a rate deviation of +/-10 seconds per year, making it 10 times more accurate than traditional quartz timepieces.DS Concept - Certina\'s international reputation as a sports brand has been founded on the DS Concept since 1959. This system makes the watches extraordinarily robust. The secret of this Double Security (DS) system lies in the elaborate security features a scratch-resistant sapphire crystal, a complicated system of seals protecting the stem and crown, and a reinforced case back.