This is a next-generation amplifier that is small, high power, and energy saving!!

Make your system louder as well as clearer. Press the
selector to activate the microphone. KEY uses a powerful internal computer to dramatically improve realism and soundstage. A massive 40-band equalizer improves timbre, and a 24dB crossover redefines each speaker's capabilities.
The concert quality of the factory stereo is revealed! What would take an expert hours to accomplish can be done in minutes to perfect specifications. Just press one button and everything starts automatically.
Compact and suitable for any car model, it is not only easy to make the sound louder, but also automatically adjusts the amplifier to check the speaker's performance and automatically adjusts the range using the 40-band equalizer and time alignment. Play clearer and more powerful music with singers.

Power (Watts/Channel): 4Ω 50×4
Frequency Response (Hz) 20-20K
Signal-to-Noise Ratio (dB) 90
Input Sensitivity (V) 250m- 10
Selectable electronic crossover
24dB/octave, selective highpass or allpass @60, 80, or 120Hz
Dimensions A (cm) 4.3
Dimension B (cm) 7.0
Dimension C (cm) 18.7