A valve stem seal assembly for an internal combustion engine includes an annular rigid case disposed around a valve guide and a valve stem. The optical transceiver includes a system memory and a consistency checker component. Each elastic band is cantilevered outward from a distal end of the panel to which it is attached. Thus, food is discharged through the hose outlets and settles in the baskets to feed sea cucumbers and to enable sea cucumbers to easily intake food. Preferably, a single adhesive strip bandage is packaged within each of these internal cavities which provides a sterile, airtight and waterproof environment. The device can also be configured such that the width of the active region is smaller than the width of the cladding layers of the stacked body; and a Ru-doped semi-insulating layer is provided in a space between the burying layer and the active region in both sides of the active region.