... to shake any hard surface, like wood, glass, wall, stone and so on, and make hard surface ... etc. Then, insert one side of the power plug into the power interface of vibration speaker, and insert the other ... current:600mA Frequency response:100HZ—17KHZ Output maximum power:10W(5-6Ω impedance) Sensitivity:80DBA kind ... to shake any hard surface, like wood, glass, wall, stone and so on, and make hard surface ...