The Men's Citizen NH8240-57E 21 Jewels Automatic Sapphire Stainless Steel 50M WR Watch is a high-quality wristwatch designed for men. It features a mechanical (automatic) movement, 21 jewels, and a sapphire crystal that protects the watch face from scratches and damage. 

The case is made of stainless steel and has a diameter of 48mm, making it a stylish and durable accessory for everyday wear.This watch is water-resistant up to 50 meters, making it suitable for swimming and snorkeling. The stainless steel band material ensures comfort and durability, while the sapphire and stainless steel case material provides a sleek and modern look. 

Overall, the Men's Citizen NH8240-57E is a reliable and stylish wristwatch that is perfect for everyday use.