Input and output are RCA interfaces, with one set of two-channel o input and one set of two-channel output, compatible with amplifiers or speakers, featuring gain compensation with 2x amplification; Internal positive and negative voltage conversion circuit doubles the effective power supply; operating voltage range is DC 5V–16V; equipped with NJM4580 dual operational amplifier from a Japanese manufacturer; 6 op amps are used in total, with 1 dedicated to gain boosting and 5 driving output stages; provides stereo output with low noise and high fidelity, suitable for long-term continuous operation; Use a low-ripple power supply and observe correct polarity—reverse connection may damage the device; Power interface is 5.5 mm x 2.1 mm with center-positive configuration; Each output channel has independent volume control; gain compensation is approximately 2 (6dB); Working voltage: DC 5V–16V; built-in negative voltage converter effectively doubles supply voltage and improves dynamic range; Material: Metal Color: Black Package Contents: 1 x o Distributor Note: Other items shown are not included. Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1–3 cm.