A testing device includes a positioning mechanism, a testing mechanism, and a controller. Each cell includes a transmitter in communication with the IO interface and in communication with every other cell of the array, the transmitter being operative to process a data packet received from the IO interface to determine a destination of the data packet and forward the data packet to at least one cell of the array selected on a basis of the determined destination. A portion of each coil is disposed above a portion of an adjacent coil, and a portion of each coil is disposed beneath another adjacent coil. The device operates to allow for a sealed combustion condensing appliance to immediately intake interior air when an exterior air source is obstructed, limited or reduced, or in response to changes in air pressure due to uncontrollable natural forces. The protection pair unit interprets the protection message and actives the connection on the protecting unit. The semiconductor device includes vertical pillars formed by etching a semiconductor substrate and junction regions which are located among the neighboring vertical pillars and spaced apart from one another in a zigzag pattern.