What does it mean to not be a medical device but have a registration certificate

Some medical devices are not highly regulated. Basic is it, because the medical device registration number is commonly known as the registration certificate, is the ID card of the medical device, but not the only one, some medical devices regulatory level is not high, there will be a similar certificate of conformity or filing vouchers and other documents, is also considered a medical device. Medical devices are instruments, equipment, apparatus, in vitro diagnostic reagents and calibrators, materials and other similar or related items used directly or indirectly in the human body, including the required computer software.