Group 1 - QDII funds allow investors to purchase foreign assets such as stocks and bonds without the need for currency exchange, with low investment thresholds starting from as little as 10 or 100 yuan [3] - The "Hong Kong Stock Connect" enables mainland investors to trade Hong Kong stocks using their A-share accounts, leading to the issuance of Hong Kong Stock Connect funds that invest in various indices like technology and dividends [4] - Hong Kong mutual recognition funds are available for sale to mainland investors, with a balanced number of bond and equity funds, and a larger scale in bond funds, primarily focusing on the Greater China region [6] Group 2 - The Hong Kong mutual recognition fund allows for the sale of Hong Kong off-exchange funds in mainland China, while the interconnectivity ETFs represent a similar concept for on-exchange trading, although the number of such ETFs is limited compared to A-shares [7]