A Point-of-Sale system, comprising: a display device including a support base including a base plate and a support frame, said support frame including an upright frame body disposed on said base plate and having a side surface, and a suspension arm projecting from said side surface along a horizontal direction and spaced apart from and disposed above said base plate, a junction of a bottom end of said suspension arm and said side surface being formed with a curved chamfer, a touch-type display screen, and a pivot mechanism disposed between said suspension arm and said display screen, said display screen being rotatable relative to said suspension arm through said pivot mechanism, characterized in that the point-of-sale system further comprises a card reader disposed on one side of said display screen; and a host computer disposed on said upright frame body and electrically connected to said display screen and said card reader, said host computer including a side cover assembled to a side of said upright frame body that is opposite to said side surface, and a locking mechanism disposed on said side cover to lock said side cover on said upright frame body; wherein said upright frame body is formed with a first latching hole and a second latching hole on two opposite sides thereof, said locking mechanism including a latching member engaged to said first latching hole, a lock-releasing button connected to said latching member, and a biasing spring, said lock-releasing button being operable to push said latching member away from said first latching hole along a release direction, said biasing spring biasing said lock-releasing button in a direction opposite to said release direction, said side cover including an latching hook engaged to said second latching hole. a display device including a support base including a base plate and a support frame, said support frame including an upright frame body disposed on said base plate and having a side surface, and a suspension arm projecting from said side surface along a horizontal direction and spaced apart from and disposed above said base plate, a junction of a bottom end of said suspension arm and said side surface being formed with a curved chamfer, a touch-type display screen, and a pivot mechanism disposed between said suspension arm and said display screen, said display screen being rotatable relative to said suspension arm through a support base including a base plate and a support frame, said support frame including an upright frame body disposed on said base plate and having a side surface, and a suspension arm projecting from said side surface along a horizontal direction and spaced apart from and disposed above said base plate, a junction of a bottom end of said suspension arm and said side surface being formed with a curved chamfer, a touch-type display screen, and a pivot mechanism disposed between said suspension arm and said display screen, said display screen being rotatable relative to said suspension arm through said pivot mechanism, characterized in that the point-of-sale system further comprises a card reader disposed on one side of said display screen; and a host computer disposed on said upright frame body and electrically connected to said display screen and said card reader, said host computer including a side cover assembled to a side of said upright frame body that is opposite to said side surface, and a locking mechanism disposed on said side cover to lock said side cover on said upright frame body; wherein said upright frame body is formed with a first latching hole and a second latching hole on two opposite sides thereof, said locking mechanism including a latching member engaged to said first latching hole, a lock-releasing button connected to said latching member, and a biasing spring, said lock-releasing button being operable to push said latching member away from said first latching hole along a release direction, said biasing spring biasing said lock-releasing button in a direction opposite to said release direction, said side cover including an latching hook engaged to said second latching hole.