Martha Light Gun Beauty Negative Pressure Water Needle Multi Purpose for SalonDESCRIPTION Martha light machine Gun beauty negative pressure water needle Multi purpose for salon How does the RF microneedle work? Fractional RF Needle System through the special design of many fractional needles point array, the high speed digital motor controls order through the epidermis and the dermis accurate to control the depth of 0. 25 3mm,again by the end of the lattice needle release RF, stimulate collagen and elastic tissue, the epidermal