The sound effect the machine, creating a shocking and good sound quality . Suitable for most of Android stytem Car Radio Stereo, conveinent intallation without breaking . Low distortion, 80w*4 max power output to improve the sound quality of your machine. HIFI level chip matching bring clear and pleasant high-quality music. aluminum casing with good heat dissipation and delicate metal touch. EQ sound effects adjustment support various sound effects such as /rock/classical music to satisfy your music enjoyment. Model: RY-125AB DC Input: 12V-18V 3A Jack Input: 1/8inch(standard stereo jack) Sin Ration: 80dB Rated RMS Power: Less than 0.1% at 1KHZ Speaker Impedance: 4-8ohm Voltage: 12V Output power: 80w*4 EQ Adjustment: support Sensitivity: 0.25mv-50mv Input Impedance: 47K Frequency Response: 20Hz-20KHz Due to different product batches, the appearance , which does not affect the use. Colour:Black Material:Metal+plastic Package Contents: 1 x Amplifier box 1 cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.