A self-propelled watercraft is disclosed, wherein the watercraft includes a body made at least partially of a polymer material, the body including a surface and at least one of a deck and a hull, wherein the watercraft includes an item of outfitting welded to the surface of the body. In standby mode, power and clock signals are reduced or stopped to conserve power. The leg portions can be configured such that, when the tool is brought into engagement with a first check valve, each leg potion can be at least partially received in a respective recess on the base of a first check valve. Therefore, the potential of the image signal to turn \u201con\u201d can be shifted within the range of the driving voltage in the display apparatus in the direction to reduce resistances at the \u201con\u201d states of the first TFT and the second TFT to reduce driving voltage and improve display quality.