Since ECG watches are classified as Class II Medical Devices, compliance is non-negotiable. For the US market, FDA 510(k) clearance is required. For the EU, look for CE MDR (Medical Device Regulation) certification. Additionally, ensure the manufacturer complies with ISO 13485 (Quality Management Systems for Medical Devices). For general electronic safety, FCC, RoHS, and REACH certifications are essential to ensure the materials are non-toxic and the radio frequencies are safe for long-term skin contact.