Features Pretty Sounds: The single directional resonance speaker with low harmonic distortion and 85dB signal to noise ratio has high sound quality. Flexible Using: Widely applied to sound playback and amplification on computers, laptops, MP3, MP4, CDs, mobile phones and other devices. Full Frequency: Full frequency range, with very clear sound quality in each frequency range, so you can better enjoy the music and melody. With Strong Bass: The bass is very strong, and the bass effect of this internal magnetic resonance speaker is equivalent to an 8in speaker. Quick to Install: Comes with a compact size and a light weight as well, the resonance speaker is very convenient to install in minutes. Specification: Item Type: Resonance Speaker Magnetic Circuit Form: Internal Magnetic Type Sensitivity: 84dB/W Rated Power: 3W Signal to Noise Ratio: 85dB Harmonic Distortion: 4TMD% Diaphragm Material: Non Paper Material Frequency Features: Full frequency band, full range. Directionality: Single Directional Package List:1 x Resonance Speaker Package List 1 x Resonance Speaker