The DME-4000 Distance Measuring Equipment is a member of the Rockwell Collins Pro Line 21 CNS family of products that feature state-of-the-art digital signal processing technology, digital audio, a consolidated tuning/data/audio bus, comprehensive maintenance software and software data loading. The Pro Line 21 CNS products set new standards for size, weight and power in the business and regional aircraft market. It retains the same form factor as the current Pro Line II and Pro Line 4 products (3.3 inches high, 14 inches long) but have reduced widths that allow size reductions of up to 50 percent and weight reductions of up to 35 percent.