Hehe, these situations are normal. First of all, the price difference is that the prices of different manufacturers' shopping malls are definitely different. Some in Qingdao are more expensive than those in Science and Technology City. Of course, after-sales service and gift packages are better. In addition, the invoice is normal. Manufacturers usually count the invoices of various buyers at the end of the month before giving you software activation, which must be online antivirus. However, if you have seen the probation period, just change it for free and change it when it expires. Hehe, if you cherish the battery, you'd better take it down and use it. If you use it, you'd better rinse it thoroughly after using it. Cleaning does not need to be considered too much. Besides, HP's poor heat dissipation is well known. Oh, don't worry too much, unless it's a very professional business book, the heat dissipation of other notebooks is actually half a catty. Don't worry, my friend.