Provided are a smart home system and control method therefor, the system comprising: a client, a cloud server, a router, a control terminal, gateway devices, and household appliances. The game play system further comprises a game play authority in communication with the acquirer transaction server, the game play authority configured to receive game play requests from the acquirer transaction server and game play information from one or more authorities associated with various game plays. A representation of a portion of the tissue is then derived from the received scattered acoustic radiation. The adaptive clamping circuit limits the level of the feedback signal under a first level for a first load condition. In order to do so, a stopper is formed inside the ejection nozzle, the stopper limiting the movement of movable valves during bubble formation.