Signal interference. Aiben hearing earphones are earphones used for level 4 and 6 hearing. Noise in FM is signal interference. Aiben is the brand of Zhengzhou High-tech Zone Foguang Electronic Appliance Factory. It was established in August 2002. It is a scientific research high-tech enterprise dedicated to the research and development and product application of wireless audio and frequency modulation technology. It is headquartered in Zhengzhou High-tech Industrial Development Zone, China. The company has established two R&D centers in Hong Kong and Shenzhen, China, and has developed wireless headsets for home TVs, square dance headsets, Bluetooth headsets for mobile phones, teaching wireless headsets, infrared wireless headsets, wireless tour guide systems, wireless training systems, wireless simultaneous interpretation systems for international conferences, Smart headphones and other core products.