1.treatment with vacuum,more comfertable 2. non insulated needles it is possible to operate equal therapy to epidermis layer and dermis layer as the needle do not have insulation plating. 3. stepping motor type different to existing solenoid type, the needle inserts to the skin smoothly with no shock, and causes no bleeding and no pain after the procedure. 4. gold plated needles needle is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis. 5. precise depth control. 0.2~2.4mm [0.2/0.4/0.6mm step] operates epidermis layer and dermis layer by controlling the needle depth in unit of 0.1mm 6. safety needle system - sterilized disposable needle tip - operator can easily notice the applying rf energy from ared light..syi