The Citizen Eco - Drive Chronograph CA0770 - 81L is perfect for men who lead active lives. Whether you're swimming, running, or in a business meeting, this watch has got you covered. Its 42.5mm diameter and 12.5mm thickness make it a comfortable fit on your wrist. Thanks to its solar - powered Eco - Drive technology, you don't have to worry about constantly changing the battery. With 100m water resistance, you can take it for a swim without any issues. The chronograph function is great for athletes or anyone who needs to time events accurately.