European retailers and customs do not treat home gas and carbon monoxide alarms as “simple gadgets.” For importers, alarm compliance Europe usually means three layers at once: product-safety evidence (often CE plus performance standards such as EN 50291 for CO), RoHS substance control on electronics, and REACH chemical duties on plastics, coatings, and packaging. This guide explains what B2B buyers should request in a document pack, how SORBO publicly frames CE / RoHS / REACH by category and market, and how to score RFQ readiness—without treating commercial checklists as legal advice.