Can it take a 1/4 mono signal and split it into L/R channels on the 1/8 plug?

No, you need a purpose built adapter for that.

Is this cable 12"tip to tip, or is is a 12" cable?

Tip to tip length is 14.25" . I don't know where the 12" measurement comes from, but the cable length itself (minus both connectors length) is 10.5" Hope this helps.

Does this work for a talkbox?

This is a passive adapter which simply allows an audio cable with a male 1/4in. connector to be plugged into any audio device having a 1/8in. socket. There is every reason to believe that it will work with a "Talk Box" if that device needs such an adapter.

Can this work in either direction, i.e., 3.5mm to ¼" as well as ¼" to 3.5mm?

Dear Amazon Customer, Yes, this MillSO 1/4 to 3.5mm adapter can work in either direction (3.5mm to ¼" as well as ¼" to 3.5mm). Thank you for your question. Hope this answer will help you, if you have any other concerns, please contact us via support@millso.com, we will always be more than happy to assist you. Best regards MillSO Technical Support Team

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1/4 to 3.5mm Instrument Cable, TRS Headphone Adapter 6.35mm Female to 3.5mm Male 1/8 to 1/4 Stereo Audio Adapter for Amplifier, Guitar, Piano, Speaker to Phone, Laptop, Headphone - 12inch/30cm

Product ID: 361237642

Details

Brand
MillSO
Color
Piano Black
Connector Type
Trs 1/4" to
Item dimensions L x W x H
12 x 3 x 0.4

🎧6.35mm female to 3.5mm male TRS adapter

🔗24K gold-plated connectors for lossless audio

🛡️Quad-layer shielding for noise isolation

€ 20.77

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Plug in, stand out — sound that commands attention.

NOISE FREE LISTENING - Quad-layer shielding blocks interference, ensuring your sound stays pure and immersive.
SEAMLESS AUDIO BRIDGE - Effortlessly connect your pro gear to everyday devices with a 6.35mm to 3.5mm TRS adapter.
DURABILITY MEETS STYLE - Piano black metal housing resists wear and corrosion, built to last through every gig or session.
AUDIOPHILE GRADE CLARITY - 24K gold-plated connectors and oxygen-free copper wiring deliver pristine, lossless sound.
CONFIDENCE IN EVERY CONNECTION - Backed by a 12-month warranty and 24/7 support, because your gear deserves reliability.

The MillSO 1/4 to 3.5mm TRS headphone adapter cable is a premium 12-inch audio connector designed to link professional 6.35mm devices like amplifiers, guitars, and pianos to consumer 3.5mm devices such as smartphones and laptops. Featuring 24K gold-plated connectors, oxygen-free copper wiring, and quad-layer shielding, it ensures high-fidelity, noise-free stereo sound with durable, corrosion-resistant piano black metal housing. Perfect for musicians and audio professionals seeking seamless, reliable audio integration backed by a 12-month warranty and responsive customer support.

Specifications

ASIN	B09B77Z5MQ
Best Sellers Rank	#14,692 in Electronics ( See Top 100 in Electronics ) #261 in Headphone Adapters
Brand	MillSO
Color	Piano Black
Compatible Devices	computer, smartphone, headphone, speaker, guitar, tablets, amplifier, piano, mixing console, home stereo system...
Connector Type	Trs 1/4" Female to 3.5mm Male Stereo Audio Adapter
Customer Reviews	4.6 4.6 out of 5 stars (3,062)
Finish	Gold
Item Dimensions	12 x 3 x 0.4 inches
Item Weight	0.03 kg
Manufacturer	MillSO
Mfr Part Number	MM35-F635-30B-US
Model Number	M35-F635-30B
Number of Items	1
Number of Ports	1
Package Quantity	1
Unit Count	1 Count
Warranty Description	MillSO offers a 12-month unconditional Warranty for all our products to guard against any quality trouble or compatibility issue. You can extend it to 18 months by contacting MillSO 24-hour customer support team. We are more than happy to solve any problem for you!
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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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€ 20.77

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Finland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews