Cold marking with UV Lasers for charger and charging cables RFH UV laser has a wavelength of 355nm and has very little thermal influence. It is a cold light source and is more suitable for processing chargers and charging cabless. The ultraviolet laser is installed on the marking machine, which can perfectly match the marking equipment to precisely control the accuracy, strength and depth, ensuring that the charging product and charging cables will not be damaged while the marking can be performed accurately.