Never used. Only opened once to make sure it was actually in there.

From Warm Audio:

1. The Ideal Studio Instrument MicrophoneFen-tone™ faithfully recreates the iconic ribbon microphone designs of the 1950s but with added modern components and features to deliver the most popular ribbon tones for instruments. Inspired by the compact, pencil-style ribbon mics loved by studios and home recordists, Fen-tone captures tight lows, lush mids, and smooth highs without harshness. Its figure-8 polar pattern and ability to handle high SPLs capture the most sought-after tones for electric guitar cabs, drum overheads, and more. With premium components like a custom Japanese ribbon, Neodymium magnet, and custom CineMag USA transformer, plus a selectable 26 dB in-line preamp, the Fen-tone ensures pristine sound even with low-gain preamps.
3. Celebrated Tone, Premium Components, Vintage BackstoryWith a boutique-quality build and design, Fen-tone™ is crafted to honor the look and feel of the vintage ribbon microphones of the 1950s, and the sound profile of the most sought-after ribbon of the 2000s. The ribbon inside Fen-tone is 99.1% aluminum, 1.8 microns thick, and custom-crafted in Japan for exceptional accuracy and performance. Paired with the ribbon is a rare-earth Neodymium magnet, designed to create a powerful magnetic field that captures intricate midrange detail with precision. The ribbon and magnet are complemented by a USA-made CineMag transformer, delivering iconic ribbon tones with modern reliability. Compact and durable, the Fen-tone is built with rugged metalwork, making it a reliable choice for demanding studio sessions.
5. Applications:
7. Electric Guitar
8. Detailed Guitar Cabs
9. Drum Overheads
10. Smooth Overheads
11. HornsBlooming Horns
12. Acoustic Guitar
13. Classic Acoustic Guitar
14. Hear the midrange detail and rich warmth of electric guitar cabs.