Featuring Eco-Drive technology that charges in natural or artificial light, the environmentally friendly Promaster SST watch #JW0030-55E from Citizen is perfect for wearing during your workout. Ultra-sporty, this eye-catching watch features a titanium case and bracelet for durability, a non reflective mineral glass that's great for sunny days, and a black dial with 1/1000 second chronograph that measures up to 24 hours. This reliable timepiece also lets you keep track of your average speed, and has a 99 minute countdown timer, rotating slide rule bezel, and 20-lap memory. Water resistant to 200 meters (666 feet), the Promaster also never requires a battery.