Advanced technology for the sophisticated aviator. Calculate critical conversions and metrics at a glance with the Khaki Pilot Converter Auto Chrono's bi-directional, rotating slide-rule bezel.This high-performance tool converts units, such as feet to meters or miles to kilometers, and currency. Add in the H-21-Si automatic chronograph movement with its superior anti-magnetic silicon hairspring and this stylish 44mm pilot's watch has everything you need for your next adventure in the sky. Water Resistance : 10 bar (100m)/145 psi (328ft). The H-21-Si is an automatic chronograph movement featuring a state-of-the-art balance spring made from the anti-magnetic material silicon for enhanced resistance to extreme atmospheric conditions. With an extended 60-hour power reserve, this powerful caliber reliably keeps and measures time via two or three sub dials at 6, 9 and/or 12 o'clock, and start/stop and reset pushers on the side.