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

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

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 noise isolation

2445F

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Sold byAmazon French PolynesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Plug into pro-grade sound — don’t miss a beat!

READY FOR PRO USE - Perfect for amplifiers, guitars, keyboards, mixing consoles, and home theaters—your all-in-one audio adapter.
NOISE FREE LISTENING - Advanced quad-layer shielding blocks interference, ensuring pure, studio-quality audio every time.
PREMIUM AUDIO FIDELITY - 24K gold-plated connectors and oxygen-free copper wiring deliver crystal-clear, high-speed sound transmission.
DURABLE FLEXIBLE DESIGN - 30cm soft PVC jacket cable offers durability and extra space between devices without signal loss.
SEAMLESS DEVICE COMPATIBILITY - Effortlessly connect your 3.5mm headphones or smartphones to professional 6.35mm audio gear.

The MillSO 1/4 to 3.5mm Headphone Adapter is a 30cm premium audio cable that converts 6.35mm male plugs to 3.5mm female jacks, enabling seamless connection between professional audio equipment and consumer devices. Featuring 24K gold-plated connectors, oxygen-free copper wiring, and quad-layer shielding, it ensures high-fidelity, noise-free sound transmission. Its durable, flexible PVC jacket and universal compatibility make it an essential accessory for musicians, audio engineers, and home theater enthusiasts alike.

Specifications

ASIN	B07DFFBNC5
Best Sellers Rank	#16,369 in Electronics ( See Top 100 in Electronics ) #270 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 (5,937)
Finish	Metallic
Item Dimensions	5.91 x 3.54 x 0.24 inches
Item Weight	18.14 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
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 ❤️support@millso.com❤️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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