Using your Tissot PRX 40mm Powermatic 80 Automatic Watch is easy. Just put it on your wrist and it'll start running automatically. To wind it up, you can gently rotate the crown clockwise. When it comes to choosing the bracelet, you can easily swap it thanks to the integrated quick - release system. For everyday use, make sure to keep it away from strong magnetic fields as this might affect its accuracy. Also, avoid exposing it to extreme temperatures. To maintain your watch, clean it regularly with a soft, dry cloth. If you notice any issues with the power reserve or movement, it's best to take it to a professional watch repair service.