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【Amplifier Board Module】 Adopt electronic components, good performance. Adopt NE5532 front-firing OPAMP for buffering, better than normal amp. 【Quality Power Amplifier Chip】Quality power amplifier chip, DC single power supply 8-25V working voltage, 50W (left channel) and 50W (right channel), two channel outputs. 【5.5mm Power Interface】With 5.5mm power interface. 100W mono subwoofer, excellent effect. 【Wide range of applications】 Can use switching power supply, laptop switching power supply, battery or car power supply, etc. 【100% Quality Assurance】Professional manufacturing which makes it stable characteristics and high reliability. It is our ultimate goal to make you satisfied. Please us if you have any problems or questions about our products. We will get back to you within 12 hours.