1.5 inch 40mm full frequency speaker 4 ohm 8W neodymium magnet smart speaker For Amazon Echo dot3 Audio Loudspeaker Unit . Created by the Danish Peerless brand, neodymium magnet super large voice coil, magnetic fluid injection voice coil cooling, guarantees small diameter super high power and high dynamics, KSV voice coil sound quality guarantee, positive aluminum cone powerfully cooperates with large voice coil bass to play, rare small Full range of caliber. Impedance power: 4 ohm 8W . Frame size: 1.6 inch 40mm , thickness 20mm . Magnetic circuit material: Neodymium inner magnet Speaker coil: 26MM voice coil, KSV material，Silver-plated stranded wire . Installation hole: 1.5 inch 38mm diagonal gong pitch 45mm. Package : 2pcs.