参考答案：

这家公司的注册资金为1500万美元，主要从事各类数码产品的进出口业务。

解析：

 [听力原文] This company has a registered capital of 15 million US dollars and specializes in importing and exporting a great variety of digital products. 

“registered capital”注册资本，“specializes in doing sth．”专业从事……。“a great variety of”意思为：各类。