Features: This circuit use three TI NE5532 operational amplifiers, with one stage for one stage for buffering, and one stage for equalization processing. It is equipped with circuit for power, which basically eliminates impact noise during power and down. Reverse connection protective for positive and negative power supply poles is provided. With boost module can convert a single power supply into a ±14.5V power supply to power the circuit, offering a large sound dynamic, capable of driving rear stage. The output with two impedance interfaces for easy connection to different power amplifiers Specifications: Component:Metal+Plastic Power Consumption: 1W Frequency Response: 20Hz-20kHz Amplification: 14dB Tone Adjustment: ±15dB Input Impedance: 50kΩ High-Impedance Output Impedance: 10kΩ, Low-Impedance Output Impedance: 600Ω Bluetooth-compatible Reception Version: 5.3 Package Includes: 1Pc Control Panel 1Pc Remote note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.