I love this binaural microphone so much I upgraded to the xlr version and selling this gently used unit. I am including the pristine case and accessories from my upgraded version as seen in the photos.

note some dents from mounting on the bottom pole (cosmetic does not affect operation at all) and I relocated the 3.5mm jack from the bottom to the front which imo is a better location when mounting a field recorder on the top of the unit- its a 2min job to swap it back if you want, but tbh i would try it this way first !

I also am including a new battery and brand new top plate - I had modified the other one to add a few mounting points for field recording equipment - happy to share pics of that setup if you are interested

pick up locally in Los Angeles to save on shipping

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The 3Dio FS Binaural Microphone is the world’s most popular 3D microphone for ASMR, virtual reality, field recording and recording studios. Used all over the world by hobbyists and professional recording engineers alike, 3Dio binaural microphones are a must-have for anyone looking for the best in 3D audio capturing.

What is Binaural?
Binaural is a recording technique that involves capturing sound using a stereo binaural microphone that is shaped and configured like two human ears. The 3Dio FS binaural microphone is a special stereo microphone that contains two prosthetic, human-shaped ears with microphone capsules embedded inside each ear canal. Binaural microphones capture audio the same way your real ears hear sounds. Incoming sound waves are changed by the ear-shaped pinna of the microphone, just like your ears would change the incoming sound waves. Our brains understand these changes as directional cues that allow us to pinpoint precise locations of any given sound. When you listen to binaural recordings using headphones, the result is a natural three-dimensional sound that gives
the listener the sensation of being in the space where the audio was recorded as well as the sensation of facing the same direction as the microphone was during the recording.

How does it work?
The FS binaural microphone output is a 3.5mm stereo (TRS), unbalanced, mic level output. It contains two matched, electret condenser microphone capsules embedded inside each ear canal and is powered by the pre-installed 9V battery. With the power switch in the ON position, the battery will last 300+ hours of continuous use. The microphone also contains a bass roll-off switch with a knee point of 160 hz. Like most condenser microphones, the 3Dio FS requires a preamp-equipped device to boost the signal to an audible level.

What are the applications?
Our customers use them for a wide variety of applications such as:

Field recordings and nature sounds
Room mic in a recording studio
Capturing 360° sounds for filmmakers
Foley sound stage
Live music
Immersive audio for gaming
ASMR & YouTube videos
Theaters performances
Standard Output
The output of the FS binaural microphone is a stereo 3.5mm (1/8") output jack. Simply plug it in to your favorite stereo digital recorder, audio interface, or mixing console to begin recording true binaural audio.

Mounting
The 3Dio FS comes standard with a 5/8" microphone stand adapter installed in the base. The microphone stand adapter can easily be removed. The base of the microphone has a 1/4"-20 female thread mounting hole that can be connected to a hot-shoe adapter or used to mount directly onto a tripod or grip handle.

Battery
The 3Dio FS contains a 9V alkaline battery within the chassis. The battery is used to power the microphone capsules and lasts 300+ hours of continuous use.

What's Included
3Dio FS Binaural Microphone
3.5mm TRS to dual 1/4” Splitter Cable, 1.5m length
1/4”-20 to 5/8” Microphone Stand Adapter
Hardshell Protective Carrying Case
9V Alkaline Battery (pre-installed)
Shipping, Fulfillment & Delivery

Specifications
Dimensions: 7.5" x 4.5" x 4.5" | 190mm x 110mm x 110mm (WxHxD)
Weight: 1.5 lbs | 680g
Output: 3.5mm (1/8") stereo jack (mic level output)

Mic Specifications
Directional Pattern: Omnidirectional
Frequency range: 50 Hz - 20kHz
Sensitivity: -28±3dB at 1kHz (0dB=1V/Pa) Rl=3.9KΩ, Vcc=5V
S/N Ratio: 80 dB at 1kHz
Max. SPL, peak before clipping: 122 dB SPL (Typ.) at 1kHz Distortion level 3% max
Output impedance: 2.4k Ω ± 30% at 1kHz (RL=3.9k Ω)
Operating Voltage: 5V (3V~10V)
Microphone capsule diameter: 10 mm (0.39 in)