ITEM NAME:Round speaker 3W 4R (3 watts 4 ohms) mini Speaker Small Audio Amplifier M&O Feature Type: electric type(moving coil) Use: PA Shape: Round Composition: a single type Rated Poweer: 3(W) Rated impedance: 4(Ω) Frequency response: 170(kHz) Directivity: Omni Sensitivity: 100(dB/W) To-noise ratio: 1(dB) Harmonic Distortion: 1(TMD%) High-quality speaker 3W 4R (3 watts 4 ohms) mini Speaker, mini amplifier dedicated Package Include 1x Round speaker 3W 4R (3 watts 4 ohms) mini Speaker package:1Pcs.High-quality speaker 3W 4R (3 watts 4 ohms) mini Speaker, mini amplifier dedicated. 1x Round speaker 3W 4R (3 watts 4 ohms) mini Speaker. Shape: Round Composition: a single type. Sensitivity: 100(dB/W) To-noise ratio: 1(dB).