An apparatus and method for measuring spatial displacement of an animal’s paw injected with irritant. MIMO downlink communications may be received from the wireless communication. The first conduit takes air in through its open end, channels the air in a direction substantially orthogonal to the direction of air flowing through the electronic equipment, and directs the air into the electronic equipment through its aligned vents. The user can change the assignment of a certian request signal from one loop to the other through PC’s BIOS, so as to allow the associated PCI-compliant unit to have a higher priority level to the use of the PCI bus system. The opto-electrical module further includes a first electric circuit component mounted on the first segment, a second electric circuit component mounted on a first surface of the second segment, a socket mounted on a second surface of the second segment opposite to the first surface, and an optical module detachably mounted to the socket. Customers with established extra credit lines may purchase goods andor service directly from vendor sites or at the credit card issuer’s web sites.