1.HI-M portable MP3 mini USB vibro /resonance speaker 2.Patented technology 3.good sound and bass 4.Manufacturers New Cute Angel Hi-M Vibro Speaker1.Patented technology;Zinc alloy metal material shell;small,simple, durable,portale and fashion design; built in rechargeable lithium battery, USB powered;strong bass is good; the real dimension of sound ;DIY music,different material,different feeling, ...