1. as the 7th generation of bluelight serial products, bl－f type contains all the excellences of the former ones, it occupies the largest exports in china and widely holds true to hospitals、clinics and families. 2. with far infrared heat treatment, it can reach the function of dredging the channels、balancing the metabolism and the calming and analgesia. 3. with bi-helix magnetic therapy under field effect, it takes effect by using the body-like spectrum electrotherapeutics and the helix magnetic field in link with the physiological electric current of human body.