built in phase switchable plate power amplifier

{"cid":"91222503","title":"250W CLASS D Subwoofer Plate Amplifier with Built-in Phase Switchable and Standby Mode for Professional Audio Systems","imgUrl":"https:\/\/img.chinax.com\/nimg\/c2\/3d\/0637860c2f9605bbbf33de8b0d16-200x200-1.jpg","attrs":{"Price":"$67.50-71.50","Model Number":"S12A","Minimum Order Quantity":"300","Place of Origin":"Guangdong, China","Output Power":"250W","Frequency Response":"20-200 Hz","Total Harmonic Distortion":"<1%","Signal to Noise Ratio":">100dB","Input Sensitivity":"180mV","Built-in Phase":"0\u00b0\/180\u00b0 Switchable","Built-in Standby Mode":"ON \/ AUTO Switchable","Auto Off Time":"15 mins","Auto On Sensitivity":"5 mV","Standby Power Consumption":"Low than 0.5W","Working Voltage":"AC110V - 240V","Dimensions":"235*204*3.0 mm","Channel":"2 (2.0)","Input Terminal":"RCA","Protection":"Output Short, over loads & over temperature"}}