An LED bare chip which is one type of a semiconductor light emitting device includes a multilayer epitaxial structure composed of a p-GaN layer, an InGaNGaN MQW light emitting layer and an n-GaN layer. Internal items based on the first parameters are compared to determine differences between the internal items in the first multilevel bill of material and the second multilevel bill of material. The device is capable of exerting negative pressure on the surface of a subject’s neck, displacing the soft tissue forward and enlarging the airway. A system for two way communication and control of a game is also provided.