This machine is named QM-808+,which is a diode laser machine,it has a 808nm wave length laser ,which can effectively apply for any unwanted hair in areas of arms,armpits,chest,legs and back etc.These are our products features :Medical standard, elegance and friendly design from out shell and software;More stable and powerful with new golden welding laser module with German DILAS bars, lifetime is more than 20 million shots; Top quality inner electrical parts, power supply, switch supply, control board, screen, pump,etc. which support the longer lifetime of the whole system; Easy maintainence, only need to change water filters every 3-6 months