First: introduce the main parts
Shell: USB wire; speaker; support shelf; motherboard; cooling fan; SSD (hardware); keyboard; mouse
Screen size: 17.3 inch, 18.5 inch, 21.5 inch, 23.8 inch, 27 inch, especially 18.5 inch and 23.8 inch are very popular.
Professor (CPU): Core: I3/I5/I7, especially I3 and I5 are very popular. from 1st -11th ,especially 3rd and 9th are very popular.
Memory : 2G, 4G, 8G, 16G;
HDD:2.5 inch HDD (500G,1TB,2TB);
SSD: 128G, 256G, 512G;
WiFi and Bluetooth,