A liquid-filled display device includes a hollow member mounted on a transparent top end wall of a hollow base and confining a water-tight inner space filled with a liquid body, and a display unit mounted on the top end wall and having a top wall and two transparent sidewalls connected to the hollow member. The layout structure includes a first conductive via, a second conductive via, a die and eight pads. , a ready to drink cola beverage or a cola beverage concentrate or syrup, including water or carbonated water, acidulant comprising at least one acid, rebaudioside D present in a sweetening amount, and flavoring comprising cola flavoring. The control signal is used to synchronize an actual velocity of the robot in order to navigate the robot according to the plan.