The XL-10 is a high-quality multi-pin breakout and extension cable designed specifically for Sound Devices 664 Field Mixer and the 552 Field Mixer. The XL-10 provides easy access to the balanced outputs and stereo return A connection on the multi-pin of the 664 and the 552. The XL-10 can be used with or without its 20-foot extension length. The XL-10 also works with the discontinued 442 Field Mixer.