[3 inch compact size design full range audio speakers sold in pair Sensitivity: 88dB 108Hz~18KHz±3dB effective frequency 5~15W power range 3 band full-range equalizer sweet crisp and clear voice suitable for 2.0 2.1 speakers DIY and home audio-visual equipment 20mm big voice coil anti-magnetic design help to avoid magnetic-field interference Size: outer diameter-φ3.5"/89mm install opening-φ2.79"/ 71mm；2.12"/ 54mm height]