Skip to main content
Home / MP3/MP4 Stands / 3439-2 Connector [CONN KEYING PLUG OR POLARIZAT]

Attributes

Brand -
Category 3C Digital Accessories / MP3/MP4 Stands
Origin -
Part Number 3439-2
Manufacturer Generic OEM
Component Type Connector Keying Plug
Function Polarization and Alignment
Material High-Grade Thermoplastic
Color Black
Compatibility Standard MP3/MP4 Dock Interfaces
Package Quantity 1 Unit
Weight 2 grams
Condition New Original

6 reviews

A

Anonymous

Mar 25, 2026

Rating: 5/5

Fast shipping

Arrived two days earlier than expected. Great for keeping stock of small replacement parts.

A

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect fit for repair jobs

Exactly what I needed to fix a broken dock connector on an older MP4 player. The polarization key aligns perfectly.

A

Anonymous

Mar 22, 2026

Rating: 5/5

Saved my old player

My stand wouldn't hold the device straight anymore. This keying plug fixed the alignment issue immediately.

A

Anonymous

Mar 19, 2026

Rating: 5/5

Genuine part

Looks and feels like an original component. No issues with installation or fitment.

A

Anonymous

Mar 09, 2026

Rating: 4/5

Good quality plastic

The material feels durable and not brittle. Shipping was fast as described. One star off because the packaging was a bit loose.

A

Anonymous

Mar 08, 2026

Rating: 3/5

Works but tight fit

It does the job of polarizing the connection, but it was a very tight squeeze to install. Had to be careful not to crack it.

5 FAQ

Q: What is the return policy if it doesn't fit?

A: We offer a 30-day return window for unused items in their original condition. Please contact our support team to initiate a return.

Q: Is this compatible with all MP3 player stands?

A: This connector is designed for standard interfaces found in many MP3/MP4 docks, but please verify your specific model's pin layout before purchasing.

Q: Does this come with adhesive backing?

A: No, this is a mechanical keying plug intended to snap into the housing or connector block. It does not include adhesive.

Q: Can I buy this in bulk?

A: Yes, we offer bulk pricing for orders over 50 units. Please reach out to our sales department for a custom quote.

Q: Is this part RoHS compliant?

A: Yes, all our electronic components and connectors meet current RoHS compliance standards.

Explore your interests

View More
All Categories
Best Seller (30)
New List (30)
Universal Reading Pen Storage Rack – Compatible with Xiao Ji Qiu Qiu, Tun Xiao Meng, Caterpillar, and JOJO Reading Pens

Universal Reading Pen Storage Rack – Compatible with Xiao Ji Qiu Qiu, Tun Xiao Meng, Caterpillar, and JOJO Reading Pens

$10.80

[Daimai Holds Micro-Needle Hair Transplant Patent] Micro-Needle Artistic Hairline Planting, 3000 Grafts for Hair Loss Treatment

[Daimai Holds Micro-Needle Hair Transplant Patent] Micro-Needle Artistic Hairline Planting, 3000 Grafts for Hair Loss Treatment

$71,950.00

PELICAN Air 1535 Lightweight Protective Case, Waterproof Photography Gear Carry-On Luggage with Free Shipping

PELICAN Air 1535 Lightweight Protective Case, Waterproof Photography Gear Carry-On Luggage with Free Shipping

$219.00

Beginner Calligraphy Set: Tian Yingzhang Ou Style Kaishu Copybook, Xuan Paper, and Red-Guided Practice Kit

Beginner Calligraphy Set: Tian Yingzhang Ou Style Kaishu Copybook, Xuan Paper, and Red-Guided Practice Kit

$9.90

High-Efficiency 15KW Three-Phase AC Permanent Magnet Synchronous Motor 380V 220V Rare Earth Variable Frequency Adjustable Speed Motor

High-Efficiency 15KW Three-Phase AC Permanent Magnet Synchronous Motor 380V 220V Rare Earth Variable Frequency Adjustable Speed Motor

$3,493.00

Genuine OEM Car Tires for Pickups, SUVs, and Vans - Sizes 145, 155, 165, 175, 185, 195 R12

Genuine OEM Car Tires for Pickups, SUVs, and Vans - Sizes 145, 155, 165, 175, 185, 195 R12

$60.00

Freestanding Toilet Storage Rack - No-Drill Bathroom Organizer with Tank Shelf and Tissue Basket

Freestanding Toilet Storage Rack - No-Drill Bathroom Organizer with Tank Shelf and Tissue Basket

$19.04

Packaging Machine for Salted Duck Eggs and Chicken Wings, Adjustable Frequency Speed MFL Drying Unit, Manufacturer Discount

Packaging Machine for Salted Duck Eggs and Chicken Wings, Adjustable Frequency Speed MFL Drying Unit, Manufacturer Discount

$37,800.00

Portable Retainer Storage Case – Compact Box for Children's Orthodontic Appliances and Invisalign Aligners

Portable Retainer Storage Case – Compact Box for Children's Orthodontic Appliances and Invisalign Aligners

$13.30

Tang Dynasty Ouyang Xun 'Stele of Lord Huangfu' Calligraphy Copybook, Close-Up Tutorial, Single Volume 79 Pages

Tang Dynasty Ouyang Xun 'Stele of Lord Huangfu' Calligraphy Copybook, Close-Up Tutorial, Single Volume 79 Pages

$9.90

Marco Sketchbook - 8K Sketch Paper, 16K Colored Pencil Paper, A4 Marker Paper for Art Students and Kids

Marco Sketchbook - 8K Sketch Paper, 16K Colored Pencil Paper, A4 Marker Paper for Art Students and Kids

$9.30

Economic Pasteurization Machine, Commercial Pasteurization Tank, Small Dairy Processing Equipment, Direct from Manufacturer

Economic Pasteurization Machine, Commercial Pasteurization Tank, Small Dairy Processing Equipment, Direct from Manufacturer

$3,430.00

Authentic Cat PAI Little Companion Daily Blind Box Figurine, Cute Siamese Cat Desktop Pet, Action Figure Birthday Gift

Authentic Cat PAI Little Companion Daily Blind Box Figurine, Cute Siamese Cat Desktop Pet, Action Figure Birthday Gift

$8.41

CANDLE.LAB | Non-Bleeding, Non-Seeping DIY Scented Candle Solid Thread Pigment - Fluorescent Dye Colors

CANDLE.LAB | Non-Bleeding, Non-Seeping DIY Scented Candle Solid Thread Pigment - Fluorescent Dye Colors

$12.80

Small-Scale Yogurt Production Line, Pasteurized Milk Processing Equipment, Yogurt Sterilization and Fermentation Tank

Small-Scale Yogurt Production Line, Pasteurized Milk Processing Equipment, Yogurt Sterilization and Fermentation Tank

$1,260.00

Blue Field Outdoor Lightweight Wear-Resistant Waterproof Dry Bag for Rafting and Stream Trekking, Storage Pouch for Miscellaneous Items, 10L/20L/40L/70L

Blue Field Outdoor Lightweight Wear-Resistant Waterproof Dry Bag for Rafting and Stream Trekking, Storage Pouch for Miscellaneous Items, 10L/20L/40L/70L

$14.00

[All-Inclusive Flat Rate] Single Imported Dental Implant | Includes Free Cleaning, Abutment, Fixture, and Crown

[All-Inclusive Flat Rate] Single Imported Dental Implant | Includes Free Cleaning, Abutment, Fixture, and Crown

$1,800.00

Acrylic Markers for Kids, Washable Art Watercolor Pens for Elementary Students, Opaque and Layerable, Direct Liquid Ink Core

Acrylic Markers for Kids, Washable Art Watercolor Pens for Elementary Students, Opaque and Layerable, Direct Liquid Ink Core

$19.90

304 Stainless Steel Chain - Long/Short Link Lifting Chain, Hoist Chain, Clothesline, Swing, Pet Chain, Anti-Theft Chain

304 Stainless Steel Chain - Long/Short Link Lifting Chain, Hoist Chain, Clothesline, Swing, Pet Chain, Anti-Theft Chain

$1.53

Wall-Mounted Face Towel Storage Box for Disposable Cleansing Tissues and Cotton Pads, Bathroom Organizer

Wall-Mounted Face Towel Storage Box for Disposable Cleansing Tissues and Cotton Pads, Bathroom Organizer

$19.90

France Arches Watercolor Paper Handmade 100% Cotton Artist Grade Sample Sheets Loose Paper 300G 640G Full Sheet Half Sheet 4K 8K 16K Medium and Rough Texture Watercolor Paint Paper

France Arches Watercolor Paper Handmade 100% Cotton Artist Grade Sample Sheets Loose Paper 300G 640G Full Sheet Half Sheet 4K 8K 16K Medium and Rough Texture Watercolor Paint Paper

$20.80

Premium Ceramic Tea Canister Gift Box – Empty Packaging for Black, Pu'er, White, and Biluochun Tea

Premium Ceramic Tea Canister Gift Box – Empty Packaging for Black, Pu'er, White, and Biluochun Tea

$121.00

Rechargeable Gen 2 Personal Air Purifier with Auto Fan for Travel, Commute, and Flights

Rechargeable Gen 2 Personal Air Purifier with Auto Fan for Travel, Commute, and Flights

$145.00

Roast Duck Warmer Cabinet, Constant Temperature Box, Commercial Crispy Pork Belly Hanging Duck Cabinet, Roasted Chicken and Cooked Food Display Warmer

Roast Duck Warmer Cabinet, Constant Temperature Box, Commercial Crispy Pork Belly Hanging Duck Cabinet, Roasted Chicken and Cooked Food Display Warmer

$318.00

Guangda Dental | Straumann Implant Services for Missing Teeth Restoration (Foshan Branch Only)

Guangda Dental | Straumann Implant Services for Missing Teeth Restoration (Foshan Branch Only)

$2,052.00

Painted Wooden Colored Pencils Set with Gold Powder, Creative Engineering Pencils for Gongbi Coloring, Basic Packaging

Painted Wooden Colored Pencils Set with Gold Powder, Creative Engineering Pencils for Gongbi Coloring, Basic Packaging

$11.12

South Korea Dentium Dental Implant Abutment with Full Ceramic Crown for Missing Tooth Restoration

South Korea Dentium Dental Implant Abutment with Full Ceramic Crown for Missing Tooth Restoration

$1,980.00

Balloon Warm Star Pre-order Unspoken Words Phase 3 17 Years Old Little Bean 'Chance Encounter' Series Merchandise

Balloon Warm Star Pre-order Unspoken Words Phase 3 17 Years Old Little Bean 'Chance Encounter' Series Merchandise

$22.00

Magnetic Punch-free Tissue Holder for Mirror Cabinets and Kitchen Cupboards

Magnetic Punch-free Tissue Holder for Mirror Cabinets and Kitchen Cupboards

$5.73

Industrial Scouring Pad Roll – Abrasive Brushed Cloth for Stainless Steel Polishing and Finishing

Industrial Scouring Pad Roll – Abrasive Brushed Cloth for Stainless Steel Polishing and Finishing

$20.00