... 15mm 5.OEM, ODM cheap 808nm/810nm/940nm diode laser machine for hair removal and skin rejuvenationWorking TheoryLasers and light sources ... self-checking function for the complete machine;5. The self-protection function for the complete machine,like water circle,circuit,voltage, ... emitter,which means that the 808nm is filtered by double filters, this makes the wavelength more accurate,to ensure the best ...