Technical information Download technical information in PDF format: The TWCO Air Controller Chronograph, equipped with a Meca-Quartz movement.How to change your TWCO bracelet and silicon strap.How to size your TWCO bracelet.TWCO double lug holes explained.Sapphire versus Mineral crystal.The Stainless Steel used for your TWCO.The 3-minute radio silence markers on your TWCO.VITON® seals in your TWCO.What makes a watch Anti-Magnetic.The TWCO® AIR CONTROLLERDLC coating