1. Appearance: The appearance of Kim Jong Learning Machine is generally white or gray, with the words "Kim Jong Learning Machine" printed on it. If the appearance does not match the official picture or the printing quality is poor, it may be a counterfeit product.
2. Function: The main function of Kim Jong Learning Machine is to provide North Korean educational content, including Chinese, mathematics and science. If the function is inconsistent with the official introduction or there are obvious bugs, it may be a counterfeit product.
3. Price: The price of Kim Jong learning machine is generally between several hundred and one thousand yuan. If the price is too low or too high, it may be a counterfeit product.