DROK S 15W Mini 3" HiFi Full Range Speaker 4 Ohm Anti-magnetic Audio 2.0/2.1 Home Stereo Woofer Loudspeaker 90dB High Sensitivity for DIY Boom box Satellites Speaker Outer diameter: 78mm; height: 52mm; Hole diameter: 71mm; rated power: 15W; effective frequency: 108hz-20khz Adopts Anti-Magnetic design, effectively protect the surrounding electrical circuits and enhance the ability of anti-interference 90dB high sensitivity, loud voice, good and Clear sound quality with good bass, provide you a good hearing enjoyment Uses blended bomb wave, strong fatigue resistance; imported rubber edge, prevent distortion Please note it's a single speaker and NOT a pair, you may order 2pcs together if you need a pair of speakers