My previous key fobs for my Pajero (Montero) and Outlander simply opened to reveal the removable circuit board and battery. The fob circuit board for the EC in Australia is completely sealed so you can't get it out of the case (see the pic). It also has a waterproof seal installed which the previous fobs did not. I would surmise the large square IC that is visible is the RFID chip and its associated antenna as this is the exact area of the fob which needs to be placed against the push start button in the case of a failed battery. The number on the IC is 2203 181013VD but a quick search doesn't show anything with that number. I think it will be a large bracelet if that is the case...