This is a speaker output relay, widely used in high-quality amplifiers during the golden age of audio from the late 80s to the 90s. It's a superb component "adopted by" famous models from various companies, such as the SONY TA-F222ESJ. For future use, I've kept it as dead stock, sealed, and stored in a plastic bag. It's now discontinued and difficult to obtain. Also, while O company's replacement is a silver alloy contact, Matsushita uses gold contacts, making it ideal for use in high-quality amplifiers. At the same time, O company's product is made in China, but Matsushita's is, of course, made in Japan. Highly recommended for those with the knowledge and technical skills to replace relays themselves, and for those pursuing the sound quality of 90s Made in Japan products. I have only a small amount of stock, so thank you for your consideration.