... 15mm 5.OEM, ODM cheap 808nm/810nm/940nm diode laser machine for hair removal and skin rejuvenationWorking TheoryLasers and light sources use ... machine,like water circle,circuit,voltage,water temperature, etc; 6. It has been proved 808nm is the most effective wavelength for the hair ... removal.There is one more filter crystal added in the front of the diode laser emitter, ...