One choice: choose a regular shopping mall, supermarket or specialty store, choose brand products; select the corresponding (matched) products according to the power of the electrical appliances, such as: air conditioners, high-power showers and other products should use 16A plug and socket, other low power The appliance can be connected to a 10A plug and socket.
Second look: see if the product logo is complete, see if there is a CCC certification mark.
Three investigations: check the certificate of conformity and the inspection report issued by the statutory department. If the converter product is not listed as compulsory certification, you should check the inspection report issued by the statutory inspection agency when purchasing.
Four tests: Perform a simple plug-in experiment. The plug should be in good contact after being inserted into the socket. There is no loose feeling and it can be pulled out with less effort.
5 Note: Do not choose the plug that can be rotated or artificially change the shape of the plug; do not use two power appliances at the same time on one socket; if the plug or socket or the power cord is too hot or sparks, stop it. Use and replace.