The chain length is about 36cm, and the extended chain is about 5cm. The product dimensions are measured manually and may have some errors. Maintenance and attention: avoid contact between chemicals (such as perfume, skin care products, bath gel, etc.) and sweat, and be sure to keep dry and clean; Store separately in a sealed bag when not in use; Avoid wearing it during vigorous exercise or swimming; Avoid wearing and rubbing multiple metal ornaments at the same time; Avoid wearing it while sleeping.