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Why are the initial few COZING-WS11/11H/WS12/13 treatments particularly effective with strong stimulation, but after some time, the stimulation seems to weaken?

This is not due to any malfunction or aging of the device. Rather, it is because the nerves in the affected ...
What is the lifespan of the COZING-WS11/11H/WS12/13 therapy device?

The main unit of the therapy device has a lifespan of 8–10 years. It is durable, sturdy, and reliable, so u...