"the product has characteristics of Product Containing Button/Coin Battery" on Amazon: what it means
The seller reports this rejection after disputing a button battery request for light signs whose remotes had battery compartments. The post says batteries weren't included. If your product contains a button battery, the checks below address that situation.
The things you must have
General Certificate of Conformity (GCC): You issue this yourself using test results.
Country of origin marking: Ask your factory.
Importer registration and customs bond: Your broker files CBP Form 5106; they'll arrange bonds for formal entries.
Check these first
If your key finder contains a button battery, ask your factory how its battery compartment meets the opening safeguards for products using that battery type. If your key finder uses a button battery, you'll need to check its battery compartment and abuse testing when reviewing the product's battery safety report. If your key finder contains a button battery, ask for the warning text intended for its packaging and instructions when checking the product's warning labels. If your key finder can carry a warning on the product itself, check that warning with your factory alongside the packaging warnings and instruction text. If your key finder is intended for children, you'll need its Children's Product Certificate together with testing from a CPSC accepted laboratory for that product.