Designed for professional use that will let you reach your limits. Strengthen your watch collection with the latest Promaster Sky. It is resilient to the rigors of everyday wear. Crafted with a light brown calf strap, sleek blue dial with yellow accents, sapphire glass, and a 42.4 mm case. For enhanced performance, features include perpetual calendar, radio controlled, world time in 26 cities, aviation slide rule inner ring and a cockpit dial design. Powered by Eco-Drive technology, never needs a battery, only a light source.*Please note that the radio-controlled functionality will not work in Australia due to the absence of radio transmitting stations within range. These stations are exclusive to four regions: Europe, USA, China and Japan. However, this does not affect manual time adjustment. Please refer to your instruction manual for guidance.