FX-AUDIO LM-01J Mixer & Preamplifier [Unopened, New] *Power adapter included

This is the NFJ FX-AUDIO LM-01J, a 4-channel stereo mixer & preamplifier with 4 RCA inputs and 1 RCA output.
An AC adapter, normally sold separately, is included.

Here is an excerpt from the product description on the NFJ website:
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[Product Features]

■ Equipped with individual volume control and mixer functions for each channel
The gain control circuit for each channel, powered by the TL062 operational amplifier, allows for independent ON/OFF (mute) and volume control for each channel.
Not only can it be used as a 4-input preamplifier, but its mixer function also allows you to adjust and mix multiple audio sources with independent volume controls for each channel, enabling simultaneous output.

■ Equipped with signal strength enhancement and gain setting (0dB/+10dB) functions
The TL062 operational amplifier located in the output stage amplifies the audio signal to enhance its strength.
Additionally, the GAIN setting switch on the back allows you to select +10dB.

■ Power circuit design focused on high sound quality
By boosting the voltage and then generating a 12V power supply, noise that affects the audible range is eliminated. This improves the quality of the power supply, realizing the smooth high-frequency characteristics inherent to operational amplifiers without any harshness.

■ Infinite possibilities depending on your ideas
- Connect it before a power amplifier to use it as a preamplifier.
- Consolidate multiple audio source devices into a single amplifier and speaker set.
- Adjust the volume balance of multiple audio sources to your preference and output them to a single system.

[Product Specifications]
- Color: Black
- Input Terminals: 4-channel Stereo RCA Terminals (Gold-plated)
- Output Terminals: 1-channel Stereo RCA Terminals (Gold-plated)
- Operational Amplifier IC: TL062CN by STMicroelectronics
- Functions: 4-channel Stereo RCA Input Mixer, Independent ON/OFF and Volume Control for 4 Channels,
- Input Gain Setting Function (Rear Slide Switch)
- Power Supply: DC12V / Power Capacity 1A or higher (AC adapter sold separately)
- Power Connector: Outer Diameter 5.5mm, Inner Diameter 2.1mm (Center Positive)
- Accessories: Instruction Manual
■ AC adapter required (sold separately) ← *This time, it is included (12V, 1A).
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That is all.

For detailed specifications, please refer to the NFJ website.
Thank you for your consideration.