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HumBird Speaker is the world's smallest and most versatile bone conduction speaker that allows you to have a different but always spectacular experience of sound anywhere; in any context. Transforms anything hollow Into a speaker; at any time.Description:Place It on top of different surfaces such as a guitar; a kraft box; a plastic storage box; photo frames; sports helmet or even dashboards canprovide you varying of sound effects.Specifications:Cabinet Material: MetalAudio Crossover: Two-WayBuilt-in Microphone: NoChannels: 2 (2.0)Feature: NoneIntelligent Personal Assistant: NONEOutput Power: 3W