Ideally, mechanical watches should be inspected and cleaned every 3-5 years to ensure proper operation. The moving parts of the quartz watch should also be checked when changing batteries; even the slightest dust particles can make the watch does not work properly. When the watch is stopped or the battery is low, replace the battery as soon as possible. Battery replacement is a quick routine. Waterproof watch can be replaced only a long time. However, if the waterproof watch is opened, a waterproof seal must be replaced. Waterproof performance can be checked by a professional agent. Keep in mind that watches that have been exposed to frequent chemicals such as chemicals or sea water, straps, watch straps, and plated cases may be damaged. Perfume or some cosmetics such as direct contact with the watch may also make the watch damaged. In all cases, timepieces made of suitable materials, accompanied by suitable straps or bracelets, will help reduce inconvenience.