WW2 pilot inspired... authentic and refined. The AERO Solar is inspired by WW2 pilot watches. The period authentic design is clean and functional. It features a precision Swiss made solar powered quartz, gold plated & jeweled movement to ensure reliable long life, 8 month power reserve and extreme accuracy. There is no need to charge or change batteries... simply wear it with maintenance free operation indefinitely. The AERO features our legendary 44 mm U.S. Patented Unibody solid titanium case for unmatched durability and comfort. The Active Comfort wrist balanced case features an impressive 200 M water resistance, R-Type sapphire crystal, and a screw down crown & case back. Versatile, refined and distinctive... authentic gear for the professional.