Third parties interested in creating Apple Watch bands should keep their designs simple and consider the environment, according to guidelines Apple released for accessory makers.

Some of the requirements are obvious, like clauses prohibiting bands from interfering with the smartwatch’s heart rate monitor or the ability to use Apple Pay. Bands must provide people with “a snug, yet comfortable, fit that prevents movement of Apple Watch relative to skin,” Apple said.

Other requirements stress less obvious issues, such as meeting the environmental regulations in the regions where the bands will be sold. The EU and China, for example, have restrictions on the amounts of nickel and formaldehyde that can be used in products that come in contact with a person’s skin.

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