GEM ETFs do not need to be opened on the Science and Technology Innovation Board. To purchase GEM ETFs, you only need to open a stock account. GEM ETFs are index funds and are traded at market prices. They can be purchased directly on the exchange. Over-the-counter ETFs are ETF linked funds and do not need to be purchased. You can subscribe and redeem by opening an account. For ordinary investors, the Science and Technology Innovation 50 ETF is an investment method that can better grasp the market and reduce the risk of individual stock investment. It can be used as the best tool for investors to invest in the Science and Technology Innovation Board.