Nickname Audio - HAS-mini Headphone Amplifier Thyris

This is a headphone amplifier, the Nickname Audio Laboratory HAS-mini.

I purchased it new several years ago and have used it with great satisfaction on several occasions.

It is in good working order with no malfunctions, and the sound output is problem-free. There are some minor scuffs on the back of the casing.

Please contact me within 24 hours of winning the auction and receiving the item. Thank you for your consideration.

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Overview
The HAS-mini is a compact, battery-powered device that drives any load at high speed and with ultra-low output impedance, achieving an extremely low total harmonic distortion of 0.00006% at 2Vrms with a 32Ω load. Furthermore, by optimizing the power voltage and current to values suitable for driving most commercially available headphones and earphones, it can achieve sufficient output even with limited power.
The HAS-mini's extremely low distortion and output impedance allow it to drive headphones, which are designed for voltage drive, faithfully and flatly to the input signal, making it ideal for reproducing binaural and 3D audio, where high accuracy is particularly required.
The playback time during battery operation is up to 5 hours, and it can be powered via a USB cable. Powering via USB cable can be done even during playback without turning off the power. When external power is detected, the amplifier power automatically switches to supply power from the external source, and the battery is disconnected from the amplifier and enters charging mode.
When the battery level drops during battery operation, the battery indicator lights up to notify the user. If use is continued thereafter, a reset function is equipped to cut off the amplifier output and safely shut down the amplifier power.

Instruction Manual (Latest Version)
https://drive.google.com/file/d/1LVULgkorS5ePhhZ0jQc9bESb7RIRXM6n/view?usp=drivesdk