ITEM NAME:2 X Resonance Speaker,Vibration Louderspeaker (44mm&27mm) Description: This novel vibration speaker can transform almost any surface into a loudspeaker. It is in essence a conventional speaker but without the normal cone that vibrates the air allowing sound to be carried to your ears. for sound and vibration experiments and demonstrations(The surface is vibrated and, in turn, vibrates the air). The speaker is suitable for use with any amplifier that normally uses an 8Ohm speaker and is for use with our audio amplifier project kits. Specification: Product size: 44MM, 27MM Material: Iron Package Includes: 2 x Vibration Speaker Novel SKU: DMO0017116919464302.This novel vibration speaker can transform almost any surface into a loudspeaker. Product size: 44MM, 27MM. 2 x Vibration Speaker Novel. The speaker is suitable for use with any amplifier that normally uses an 8Ohm speaker and is for use with our audio amplifier project kits.