... 3A) have advantage of small size, light weight, easy operation and convenienc. Portable 15W Co2 laser therapy instrument (JZ ... 3A) have advantage of small size,light weight, easy operation and convenience of taking with special suitcaseof aluminium alloy. ... dermatology, stomatology, urology and otorhinolaryngology(ENT).The process of operation is simple and rapid with little painto the patient.Major ...