Mix&Rock KS Black Leather Strap Tourbillon Moon Phase Automatic Mechanical Watch All items go with 12 months warranty . Perfect gift for father or boyfriend Mechanical Watch need to be wound occationally to keep the right time Mechanical Watch need to be wound occationally to keep the right time The watch is located in USA, fast delivery,free shipping Note: Many watches have a screw down crown that must be released. And please wind the watch everyday.winding method: clockwise twisting the time adjust button without pull the button out. if you ware it all the day, it does not need to be wind up (turn the crown) before every usage, it can move automatically when you moving your arms. But if you lay it down for a long time then you need to wind it before usage.