Parts can be divided into two categories: standard and optional accessories.
Standard accessories are provided accessories. Standard on all models are not the same, common memory and standard parts for the paper tray. Of course for different models, memory size and paper tray capacity is different. Standard configuration to check out the product description to understand the situation. If the standard configuration is missing, to some extent, affect the use and performance of the product.
Optional accessories refer to the standard configuration, can enhance product capabilities, improving product performance parts, is needed to make a purchase. And standard configuration, do not use the optional accessory will not affect the use of the basic functionality of the product. Optional accessories for many types, optional products that support different products is also different, so when you purchase optional accessories should have read the description of the product, so as not to buy cannot be used.