... portale and fashion design; built in rechargeable Specifications:Patented technology;Zinc alloy metal shell; small,portale and fashion design ... effectMODEL:AD-315 mini vibration speaker,1. Patented technology;Zinc alloy metal material shell;small,simple, durable, ... standard 3.5mm audio plug 3.Technology:Using our self-developed core of technology called preaching vibration multidimensional sound,which ...