Features: Tip: Sufficient output power will only be available if the auditory input is sufficient and the supply voltage/current is sufficient! The higher the power supply voltage the higher the output power, the lower the speaker impedance the higher the output power! Please make sure that the adapt power supply is greater than the actual working power of the amplifier! With over-voltage, under-voltage, overheating, circuit protecting. For home entertainment, parties, performances, auditory-visual studios and other place that require strong bass effects. Also suitable for outdoor activity, traveling and other occasions that require portable auditory. Specifications: Model：D1200 Subwoofer Digital Amplifier Board Channel: 2.1CH Support：BT5.0+AUX+MIC+FM+USB+TF Card Power：50W+50W+100W Adaptable power supply DC15V/5A-8A or more rechargeable use. Applicable speakers: 20~100W, 4~8ohms Output power: left and right channel less than 50w, subwoofer less than 100W Support: over-voltage, under-voltage, overheating, circuit protecting Size: about 260x75mm/10.24x2.95in Package Includes: 1Set D1200 Subwoofer Digital Amplifier Board note: There might be a bit color distortions due to different computer resolution There might be size errors due to different computer resolution