If in accordance with the European Union standards to do the CE certification, you said all belong to a class.
According to the national standard, these products can be divided into 6826 physical therapy and rehabilitation equipment in the physical therapy and rehabilitation apparatus
in the simple anti-snoring device, chest and back orthopedic device, upper limb integrated trainer, elbow exerciser, lower limb rehabilitation exerciser, orthopedic retractor also belongs to a class.
If the belt has magnetic therapy or infrared can promote blood circulation and other energy exchange, belongs to the second category