A system to securely login a mobile device may include a storage means for storing an encrypted file, a certification system to receive the encrypted file from the storage means, and a customer transaction system in communication with the certification system. With each of the apparatus and the method, it is possible to form a high-quality image in an ink jet printing system. One end of the supporting member connects to the middle of the first plate to support the expansion card. The gate driving circuit drives the IGBT into the OFF state based on the signal from the timer circuit. The bottom removable adapter, in one embodiment, facilitates to receive paintballs via a bottom feeding mechanism.