Description: This is a mini 2 channel HiFi stereo audio power amplifier for home / car audio, motorcycles, boats, MP3, and so on. 20W + 20W output, 12V amplifier with bass, treble & volume control in small size is easy to install and use. Order it and enjoy music. Features: All aluminium alloy shell, to eliminate all kinds of electromagnetic interference. Using high-power audio amplifier chip, the output power is 20W +20 W. Suitable for no more than 6 inches & impedance of 4-8Ω 20W speakers. Two pairs of speaker output clips, easy to wire. Support high & low frequency adjustment. Specifications: Output power: 20W + 20W Input Power: 12V DC Input Sensitivity: 200mv Input Impedance: 47Kohm Speaker Impedance: 4 - 8 ohms Frequency Response: 20Hz to 20KHz Min. THD: 70dB Color: Red Size: Approx.125 x 70 x 40mm / 4.9 x 2.8 x 1.6inch Material: aluminium alloy Package weight: 228g Package List: 1 x Power Amplifier 1 x User Manual . Note: 1. The product is constant impedance matching, and does not support constant voltage matching (for example: The general constant voltage speaker (power supply AC70-120V) outer package is equipped with a transformer or a transformer on the speaker). 2. Products with power amplifier are not supported, that is, those with built-in power amplifier function (the power amplifier effect is not good); please confirm whether your equipment complies with it before ordering.