20 millions s life for longtime used,has been safe in the medical field for many years, has been unanimously affirmed. three laser wavelength combined for all skin type treatment 755nm for white skin hair removal 1064nm for black or dark skin hair removal 808nm for other type skin colour hair removal exceiient performance dispiay screen:the large size of the display screen makes the operation more accurate, and the sensitive sensing device makes the operation more comfortable and smooth. cooling system:air cooling&water cooling&sapphire contact cooling&semi-conductor cooling,which ensure the machine work 24 hours without s excellent after-sales protection and technical guidance, ready to answer all kinds of product questions for you..syi