The flight-inspired Nighthawk exemplifies a beautiful "blackout" appeal. This 1/5 second chrono measures up to 60 minutes, with 12/24 hour time & tachymeter. THe Nighthawk is in-cased in a 42mm stainless steel black ion plating with screw-back case and bracelet with safety foldover clasp with push button. Citizens Nighthawk is also 200M WR featuring Eco-Drive technology – powered by light, any light. Never needs a battery.