Microphone Amplifier Audio-Technica AT-MA2

I purchased this item before and used it for a while, but it has been stored away since then.
This is a long-term home storage item.
Please purchase only if you understand this.

[Unopened] Audio-Technica Microphone Amplifier AT-MA2.
Allows microphone input and amplification for AV equipment without microphone terminals.
List Price: ¥8,800

[Features]
- Enables microphone input for AV equipment lacking microphone input terminals.
- Compatible with both φ6.3mm standard plugs and φ3.5mm mini-plugs* for your microphone.
- Switchable between monaural/stereo microphones to match your microphone. Supports plug-in power.
- Metal body & compact size.
- AC adapter included.

[Specifications]
- Rated Output Level: -10dBV
- Maximum Output Level: +2dBV (at 1kHz, 1% T.H.D.)
- Frequency Response: 20Hz - 20,000Hz (-3dB)
- Gain: +20dB (when GAIN is MIN), +50dB (when GAIN is MAX)
- Maximum Input Level: -18dBV (when GAIN is MIN)
- Total Harmonic Distortion: 0.05% (when GAIN is MIN), 0.2% (when GAIN is MAX)
- Equivalent Input Noise Level: -110dBV (when GAIN is MIN), -120dBV (when GAIN is MAX)
- Power Supply: DC9V (AC adapter)
- Current Consumption: 30mA (maximum)
- Input Terminals: Microphone Input (φ6.3mm standard jack / φ3.5mm 3-pole mini jack)
- Output Terminals: Line Output (RCA pin jacks x 2)
- External Dimensions (excluding protrusions): H30 x W70 x D92mm
- Weight (main unit only): Approx. 160g

Please consider that this is a used item stored at home when making your purchase.