According to Sohu's inquiry, Radium Core Optoelectronic Co., Ltd. is a company specializing in R&D, production and sales of optoelectronic semiconductor devices, including lasers and detectors, which are widely used in optical communication, lidar and other fields. Founded in 2004, the company is headquartered in Shenzhen, China, with R&D and sales centers in the United States and Japan. On 20 17 and 1 month, Radium Core Optoelectronics was successfully listed on the Nasdaq Stock Exchange with the stock code "REX". Besides listing on NASDAQ, Radium Core Optoelectronic also actively expanded the China market and listed on domestic A-shares.