3. Pay attention to which parts are included in the standard configuration of the product
Most manufacturers (especially domestic manufacturers) can't show the standard accessories through their product numbers. Generally we can understand that a junction box contains a box cover, a box body, a sealing strip and a box cover screw. According to different needs, manufacturers will also be equipped with such optional accessories as wall fixed corner, floor installation, cable connector, etc. In order not to cause trouble afterwards, it is very necessary to find out which parts are standard and which are optional accessories before ordering.