The present invention provides a mobile power pack with fragrance feature is disclosed. In a method for inducing weight loss, the prosthesis is placed in the collapsed position and inserted into a stomach of a patient. A receiving unit is connected to the computer host. The controller determines whether the storing medium has a free region for recording the activity log file in the storing medium. The excess scratch-off material falls into the retention tray, which is slidably removable from a rear portion of the enclosure.