This Citizen Eco - Drive ZENSHIN watch is great for men who love stylish and reliable timepieces. It's perfect for everyday wear, whether you're at work, on a date, or just out for a casual stroll. With a case diameter of about 39.5mm and a weight of 91g, it's comfortable to wear all day. The watch features an Eco - Drive movement with a 240 - day power reserve, so you don't have to worry about constantly changing the battery. The sapphire crystal glass is scratch - resistant, keeping the watch looking new for a long time.