Sanken has introduced the COS-11D, which overcomes RFI (radio frequency interference) from the digital transmitter. In todays wireless transmission systems the microphone must remain unaffected by new forms of digital transmitter signals. They present new challenges in the area of emission protection. In many cases, noise levels increase and the S/N ratio is deteriorated by the interference of digital transmitters. Sanken has designed the COS-11D specifically to diminish the instances where interference is an issue. Four colors are available in the COS-11D series: Black, Gray, Beige and White.Main Features: Overcomes digital transmitter RFI Water Resistant Durable Design Great Clear and Rich Sound 4 Color Choices Improved Moisture Resistance Original Vertical Diaphragm Design Optimized for the Human Voice AA battery PSU XLR-M