Citizen Men's Watch Skyhawk A T Chronograph Radio Controlled Eco Drive Case Width_45mm Strap Bracelet: 24mm Lug Strap Bracelet: 24mm Lug Width Black Silicone Rubber Strap with Blue Plated Stainless Steel Pin Buckle with enamel inserts along the arms and double nose bridge adding an extra dimension to this otherwise minimal pair Radio Controlled Atomic Clock Synchronisation for Superior Accuracy World Time in 43 Cities 1 100 Second Chronograph Measures up to 24 Hours 99 Minute Countdown Timer Power Reserve Indicator 2 Alarms Citizen Eco Drive technology harnesses the power of light from any natural or artificial light source and converts it into energy which is stored in a rechargeable lithium ion cell