Using your Tag Heuer Aquaracer is easy. Simply set the time according to the instructions in the manual. Since it's water - resistant up to 200m, you can wear it while swimming or doing water sports, but avoid extreme pressure changes. For maintenance, wipe the watch with a soft, dry cloth regularly to keep it clean. If the quartz battery runs out, take it to an authorized Tag Heuer service center to replace the battery. Also, avoid exposing the watch to harsh chemicals or strong magnetic fields, as they may affect its performance.