Good working used effects pedal.
The Pigtronix Philosopher’s Tone is an optical compressor/sustainer pedal known for providing noiseless, studio-grade sustain and "endless" sustain without losing natural pick attack. It features a blend control for parallel compression, treble control, often driven by internal 18V rails for high headroom. 

Description & Key Features

• Compression Type: Optical (analog).
• Sustain: Offers extreme, clean sustain that remains musical.
• Blend Control: Allows mixing of the original clean signal with the compressed signal, preserving pick attack.
• Treble: Boost/cut (+/- 6dB at 2kHz) for tone shaping.
• Architecture: Internal 18V voltage doubling from a 9V input ensures high headroom.
• Bypass: True Bypass. 

Specifications

• Input Impedance: High impedance input.
• Output Impedance: 150 ohms.
• Power: 9VDC @ 100mA (Standard negative tip).
• Weight: Compact, pedalboard-friendly sizes (Micro/2). 

The Philosopher's Tone is designed to offer clean, transparent compression, making it suitable for both subtle signal balancing and creating heavily sustained, driven leads. 

ATTENTION:

I sell TOOLS for musicians...not museums or collectors. If you are looking for a great working tool for creating music and gigging, I believe you will be comfortable working with me. If you are looking for a piece for your personal museum, please leave me out of your purchasing process! I have ZERO patience for the anal retentive collector and we will just be wasting each others time and testing the extent of our patience. Additionally, and with all respect, your purchase does not mean that the seller is responsible for teaching you to use your product nor are we responsible to force YOU to read the manual.