Am I missing something? I connected this to my electric guitars and only got mono. I expected stereo.

The output jack of 98% of electric guitars has a hot signal on the tip and a ground on the sleeve. That's why instrument cables have a tip and a sleeve -- to accommodate those connections. Plugging a stereo cable into a monaural guitar will not make it stereo. You're only get signal to the tip -- the left side output. If you want to hear out of both sides of earphones, you'd first have to run your guitar to a mixing desk, then to your headphones.

Do these work with beats headphones? I have a pair of the newer ones

Dear MillSO Customer, Thank you for your question. If your bose headphones have a standard 3.5mm plug, you can test. This 1/4 to 3.5mm adapter is used to connect smartphones, tablets or headphones with standard 3.5mm plugs to audio devices with a 6.35mm stereo jack. If you have any other problems, please contact us via support@millso.com, we will always be more than happy to assist you. Best regards! MillSO Technical Support Team

I want to use my headphone on my Yamaha digital piano. my headphone is 3.5mm, and the piano is 6.35, will this work?

Dear MillSO Customer, Thank you for choosing us. Yes. This adapter fits for your headphone and Yamaha digital piano. But please notice that it has no mic function. If you have any other problem, please contact us via support@millso.com, we will always be more than happy to assist you. Best regards! MillSO Customer Support

Would this work on a car radio the microphone input for your phone ? I have a micro phone 2.5 and I believe the radio is 3.5

No. This adapter is 6.35mm male to 3.5mm female cable. If you have any other problem, please contact us via support@millso.com, we will always be more than happy to assist you. Best regards! MillSO Customer Support Team

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MillSO 1/4 to 3.5mm Headphone Adapter TRS 6.35mm 1/4 Male to 3.5mm 1/8 Female Stereo Jack Audio Adapter for Amplifiers, Guitar, Keyboard Piano, Home Theater, Mixing Console, Headphones - 12inch/30CM

Product ID: 71186245

Details

Color
Blue
Connector Type
1/4" to 3.5mm
Item dimensions L x W x H
5.91 x 3.54 x
Specific Uses For Product
Amplifier

🎧24K gold-plated connectors for lossless audio

🔌30cm flexible PVC jacket cable for extended reach

🛡️Quad-layer shielding for crystal-clear sound

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€ 15.97

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your sound game—connect like a pro, hear like a legend!

NOISE FREE LISTENING - Advanced quad-layer shielding blocks interference for studio-quality audio clarity.
PREMIUM AUDIO FIDELITY - 24K gold-plated, oxygen-free copper wiring ensures pure, high-speed sound transmission.
SEAMLESS COMPATIBILITY - Effortlessly connect 3.5mm devices to 6.35mm audio gear—perfect for pros on the go.
DURABLE FLEXIBLE DESIGN - 30cm soft PVC jacket cable offers durability and freedom to position your devices with ease.
TRUSTED SUPPORT WARRANTY - Backed by 12-month unconditional warranty and 24/7 expert customer care—stress-free connectivity.

The MillSO 1/4 to 3.5mm Headphone Adapter is a 30cm premium audio cable designed to convert 6.35mm male plugs to 3.5mm female jacks. Featuring 24K gold-plated connectors, oxygen-free copper wiring, and quad-layer shielding, it delivers high-fidelity, interference-free sound. Compatible with amplifiers, guitars, keyboards, mixing consoles, and headphones, this durable adapter ensures seamless, lossless audio transmission with a flexible, wear-resistant PVC jacket. Supported by a 12-month warranty and 24/7 customer service, it’s the essential tool for professionals demanding flawless connectivity.

Specifications

ASIN	B07DFFBNC5
Best Sellers Rank	#13,935 in Electronics ( See Top 100 in Electronics ) #250 in Headphone Adapters
Brand	MillSO
Color	Blue
Compatible Devices	Headphone, speaker, electronic keyboard, Audio mixer, amplifiers, electric guitar amp/piano, stereo system, mixing console, home audio, home theater devices, AV receivers
Connector Type	1/4" to 3.5mm stereo
Customer Reviews	4.7 4.7 out of 5 stars (5,928)
Finish	Metallic
Item Dimensions	5.91 x 3.54 x 0.24 inches
Item Weight	17.96 g
Manufacturer	MillSO
Mfr Part Number	YytcMTF635UUs30Cm
Model Number	F35-M635-30U
Number of Items	1
Number of Ports	2
Package Quantity	1
Power Plug Type	No Plug
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Amplifier,Speaker
Unit Count	1 Count
Warranty Description	MillSO offers a 12-month Unconditional Warranty for all our products to guard against any quality trouble. Please feel free to contact our warm 24-hour customer support team via ❤️[email protected]❤️if you need any help.
Warranty Type	Extended

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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