Techniques adapted for use with recharging a rechargeable power source of an implantable device. The liquid container is supported in an upright configuration and includes a display portion on an upper side thereof, and a light emitting portion which emits light for display by the display portion. With the present invention, it is possible to decode bitstreams, encoded in various ways according to each standard, by using the same information recognizing method. The terminal determines coordinate information of the electronic pen with respect to the foldable display unit by measuring a folding angle of the foldable display unit. A cap covers the valve and a pair of seals is located between the sealing surface and the cap.