Free tools Windows power users keep installed
One-click scans. No signup required.
Necomimi is a real, motorized cat-ear headband that uses sensors on the wearer’s forehead and ear to measure brain activity and move the ears. Its software estimates broad concentration and relaxation signals; it does not decode thoughts or reliably identify emotions such as happiness or sadness.
What Necomimi is—and what it is for
Necomimi is a wearable novelty device developed by Japanese design company Neurowear, with consumer EEG technology from NeuroSky. Rather than serving as a medical monitor, it turns broad, algorithmically inferred states into a visible, playful gesture. Neurowear presents it as a form of nonverbal expression suited to settings such as cosplay, parties and conventions. Neurowear’s product page and NeuroSky’s account of the concept describe its origins and intended character.
How the EEG sensing and ear movement work
Sensors contact the skin around the forehead and ear and pick up electrical signals associated with brain activity. The device processes those signals to produce attention- or concentration-related and relaxation-related values, then uses motors to move the ears when its software’s internal thresholds are crossed. The newer product listing describes scores from 0 to 100 calculated about once per second; the full algorithm and thresholds are not published. The product listing and NeuroSky’s explanation of the movements outline this behavior.
That distinction matters: EEG is the measurement of electrical activity at the scalp; the device’s scores are features derived from that signal; and labels such as concentration or relaxation are software interpretations. The ears display those interpretations, not a direct transcript of thoughts or a validated reading of a person’s emotional state.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- manufacturer: Neurosky
- Item Trademark: NEUROSKY
- Item Weight: kilograms pounds 03968320716 018
- Item Category: Headphones
What the ear movements are intended to indicate
| Movement | Advertised interpretation | How to read it |
|---|---|---|
| Ears stand or perk up | Increased concentration or attention | A change in the device’s concentration-related estimate, not proof of a particular thought. |
| Ears droop | Relaxation | A broad software category, not a specific emotion. |
| Ears perk and wiggle | High concentration and relaxation together, marketed as “zone” | Neurowear compares this to peak performance in athletes; it is the company’s description of the device’s output, not a universal physiological diagnosis. Neurowear |
| Small twitches | Changing brainwave input | Movement may reflect changing input rather than a meaningful social signal. |
| One ear up and one down on older models | Possible loss of sensor contact | Check sensor placement before interpreting it as a state. The older-model teardown and manual notes this possible contact problem. |
Does it detect your state of mind?
Only in a narrow consumer-gadget sense. Necomimi responds to EEG-derived measurements that its software associates with attention and relaxation. It does not identify a specific thought, memory, intention, or command, and the product documentation does not establish that it can tell whether someone is happy, sad, anxious, attracted to someone, or being truthful. “Mood-reading” is therefore too strong: the most accurate description is that the ears visualize broad, proprietary signal categories.
The same caution applies to “zone.” Neurowear describes the behavior as simultaneous concentration and relaxation and relates it to athletes’ peak-performance state. The product’s output is determined by its own categories and thresholds; it does not verify that the wearer has entered a universally defined mental state.
Rank #2
- Wolf Ear Headband: This adorable animal ear headband is the perfect accessory for your cat, fox, or werewolf costume. It adds a playful charm to your look and is sure to make you the center of attention.
- Reliable Quality: This animal ear headband is crafted from premium faux fur, offering a soft and comfortable feel with a realistic, vibrant appearance that adds authenticity to your cosplay or costume.
- Flexible Adjustment: The headband is easy to wear and stays securely in place. The distance between the ears is adjustable. The fox ears feature an internal metal frame that can be bent and folded, allowing you to easily shape them into various forms according to your preference.Suitable for both men and women.
- Unique Decorative Effect: This adorable cat ears feature soft, fluffy faux fur for a vivid, lifelike visual impact. Available in multiple colors, they effortlessly coordinate with other accessories and outfits. Truly a exquisite and unique fashion accessory.
- Versatile Costume Party Accessory: Our stylish and cool cat ear headband is perfect for costume parties, carnivals, Christmas, Easter, New Year celebrations, Halloween, and more. Make you the center of attention at every event!
From 2011 concept to a newer model
- Spring 2011: Neurowear presents the Necomimi concept. Neurowear’s project page gives the project history.
- July 12, 2012: NeuroSky announces the U.S. commercial launch at San Diego Comic-Con. The release listed the original model at $99.95 and described its use for entertainment and events. Launch announcement
- 2021: Neurowear says an updated model appeared, replacing the original’s AAA-battery setup with a rechargeable design. Neurowear’s page
How the original and newer models differ
| Specification | Original U.S. model (2012) | Newer model (introduced 2021, per Neurowear) |
|---|---|---|
| Power | Four AAA batteries | Built-in 3.7 V, 600 mAh lithium-ion battery |
| Charging | No rechargeable charging method stated in the launch source | USB Type-C |
| Approximate operating time | About four hours, as listed for the original model | About two hours, depending on movement frequency |
| Approximate weight | About 200 g | About 180 g |
| Dimensions | Not stated in the cited launch source | About 280 × 170 × 60 mm on Neurowear’s page; another listing gives about 29 × 17 × 6 cm |
| Price signal | $99.95 at the U.S. launch in July 2012; historical price, not a current quote | ¥14,850 including tax on a Japanese product listing; not a confirmed U.S. price |
The newer listing also specifies an operating environment of 10–40°C and 20–80% humidity. It lists the headset, ear parts and USB cable as included components. These are listing specifications, not a guarantee about every unit or seller. Current product listing
Availability and buying considerations
The accessible listings for the newer model are Japanese storefront pages, and both were shown as sold out in the reviewed listings. The ¥14,850 tax-included listing is not a current U.S. retail price, and dependable U.S. stock was not established. Check the seller’s live stock, shipping destinations, warranty, replacement parts and import charges before making plans to buy. The official English-facing shop is Necomimi’s shop; the affiliated listing is UX-XU.
Rank #3
- Moldable Plush ：Shape them, wear them, love them! The built-in flexible wire lets you create custom looks in seconds. Quickly switch up your style for a convention, party, or just for fun. Find the perfect match for your outfit and mood every time!
- Handmade:these exquisite accessories are made of faux fur and are all handmade, each piece of fur is meticulously combed!Easy to wear, unique design , Bright Color and Multicolor options make you more charming and attractive
- Radiate Confidence:Designed to enhance your natural charm and luminosity. These vibrant formulas help you create a playful, head-turning look that shines all day.
- Fits most : instantly upgrades your style. Featuring playful ear tips for a unique, head-turning look. Wear your personality!
- Occasion:cosplay, party, club ,masquerade ,New year, Halloween, , carnival, show and more
- Best suited to: cosplay, conventions, parties, demonstrations and playful interest in consumer brain-computer interfaces.
- Less suited to: all-day wear, dependable emotion recognition, research measurement, or medical or mental-health monitoring.
- Practical trade-offs: the newer model’s listed operating time is about two hours, and the headband requires reliable skin contact. Availability and repair support may be difficult to secure outside Japan.
- Privacy: No current privacy policy or data architecture was established in the available product information. Check how any connected software handles data before using a brain-sensing product.
Getting a steadier reading
- Charge the newer rechargeable model before use.
- Place the forehead sensor against skin and position the ear sensor or clip correctly.
- Move hair, hats and accessories away from sensor contact points.
- Remain relatively still while the device settles; movement can disturb contact or input.
- If readings seem erratic, check sensor contact, skin dryness and battery level before assuming the device is broken. The current product FAQ says dry skin can make detection difficult and recommends lightly moistening the forehead or earlobe. Product FAQ
Do not treat every twitch or change in position as a reliable report of what the wearer feels. The output can change with sensor contact, movement and brain-signal input, and the system’s categories are broad.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common behavior
The ears move unpredictably
Check that the sensors touch skin, hair or clothing is not in the way, the wearer was still while the device settled, and the battery is charged. Dry skin and electrical interference can also affect sensor input. The older teardown and manual discuss contact-related behavior; the current listing addresses dry skin.
Rank #4
- Moldable Plush ：Shape them, wear them, love them! The built-in flexible wire lets you create custom looks in seconds. Quickly switch up your style for a convention, party, or just for fun. Find the perfect match for your outfit and mood every time!
- Handmade:these exquisite accessories are made of faux fur and are all handmade, each piece of fur is meticulously combed!Easy to wear, unique design , Bright Color and Multicolor options make you more charming and attractive
- Radiate Confidence:Designed to enhance your natural charm and luminosity. These vibrant formulas help you create a playful, head-turning look that shines all day.
- Fits most : instantly upgrades your style. Featuring playful ear tips for a unique, head-turning look. Wear your personality!
- Occasion:cosplay, party, club ,masquerade ,New year, Halloween, , carnival, show and more
One ear behaves differently from the other
On older models, asymmetrical ears can indicate that a sensor has lost contact. Reposition the sensor first; do not infer a special mental state from the asymmetry.
You cannot make the ears move on command
Neurowear says users may become accustomed to influencing the output, but that is not precise voluntary control. Attention, relaxation, fatigue, movement and sensor quality can all affect the result.
Best Value
- 2 PACK FOR MATCHING & SHARING: Includes two fuzzy cat ear headbands for matching looks, sharing with friends or family, or keeping an extra on hand. Great for coordinated costumes, parties, festivals, group photos and playful everyday looks.
- FLEXIBLE FIT WITHOUT FEELING TOO TIGHT: Measures approximately 6.7 x 7 inches with a flexible inner band that adapts comfortably to different head sizes. Designed to stay securely in place while providing a comfortable, pressure-free fit.
- SOFT & COMFORTABLE FOR EXTENDED WEAR: Hand-sewn with soft teddy bear fabric and PP cotton filling for a fluffy, cozy feel. Lightweight construction helps provide lasting comfort without feeling heavy during parties, cosplay, beauty routines or everyday wear.
- CUTE & FLUFFY CAT EAR LOOK: Plush upright ears create a fun, playful cat-inspired look that instantly adds character to costumes and outfits. Perfect for cosplay, Halloween, themed parties, dress-up, festivals, photo shoots and creative styling.
- KEEPS HAIR AWAY FROM YOUR FACE: Practical as well as cute, the headband helps hold hair back during makeup application, skincare, face washing and spa routines. A fun hair accessory for getting ready, relaxing at home or taking photos.
The movement does not match how you feel
The device does not measure named emotions directly. A mismatch between its broad signal category and the wearer’s own description is not, by itself, evidence of a fault.
Alternatives if you want a different kind of control
No directly equivalent, currently available EEG-controlled cat-ear competitor is established by the cited product information. Other approaches serve different purposes:
- Ordinary motorized cosplay ears: can provide predictable movement without EEG input.
- Gesture- or voice-controlled ears: offer more direct commands, but do not respond to brainwave signals.
- DIY EEG projects: allow experimentation but require a separate EEG headset, electronics, motors, programming and calibration.
- General consumer EEG headsets: may support other experiments, but compatibility with Necomimi’s hardware and proprietary control logic should not be assumed.
Nothing in the cited product documentation establishes Necomimi as a medical device, diagnostic tool, treatment, or validated monitor for ADHD, anxiety, depression, autism, stress disorders, cognitive impairment or neurological disease. It is not a substitute for clinical EEG, professional assessment, sleep studies or validated physiological monitoring.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Recommended Free Tools
