Functions: date, hour, minute, second. Power reserve up to 80 hours. Power reserve is the time a fully wound mechanical watch runs until it stops usually between 38 and 42 hours.So you can leave this watch for up to three days before having to set it anew if you can do without it for that long.. Check out my other auctions! The item "Tissot PR100 Powermatic 80 COSC Certified Men's Swiss Made Automatic Watch NEW" is in sale since Wednesday, July 14, 2021. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watches\Wristwatches". The seller is "u-trust-me" and is located in USA Sportswear. This item can be shipped worldwide.