The Seiko 5 Men's Automatic Silver-Toned Stainless Steel Watch with caliber number 4R35 boasts high-tech Japanese automatic movement hidden behind classic analog styling. Precise 23-jewel Japanese automatic movement keeps this watch functioning without a battery: It is powered automatically with the movement of your arm. There is an automatic winding mechanism but then it does not need any hacking or hand winding to get the watch started. Every time the watch is worn, an oscillating weight in the movement winds the mainspring, thus ensuring the mainspring remains fully wound. The Seiko automatic watch needs just to be set at the correct time and given a shake to charge up and gives you the most accurate and reliable time with a power reserve up to 40 hours. An exquisite pick for fashionable Men is this Casual Watch from Seiko. Lending you a stylish look all day long, this watch will impress you with its beautifully done with a Round shape and trendy band.