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PROMASTER DX Series Digital modules allow for seamless operation with the advanced features of your digital camera*. Features include an infrared focusing assist lamp to help you get sharp crisp pictures in low light. The DX Series Digital modules work only with the PROMASTER 5750DX and 5550DX digital flashes and are not backwards compatible to other 5000 series flash units. *Features are limited to those supported by your particular camera model.