Are the internal contacts gold plated, or just the visible ring in front?

Just the ring up front. The internal connections are a silver colored metal for soldering.

The pictures in the ad show 3 terminals on the back, the jacks i received have 4. How do i determine which is which??

I don’t recall mine having 4 connection terminals.. but when in doubt, use the continuity setting on a volt/ohm meter to determine which wire/connection is which. If you don’t know how to do that, ask the Internet.

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Longdex 3.5mm Stereo Panel Mount Jack 3PCS 3.5mm 1/8Inch Mini Female Stereo Panel Mount Solder Headphone Socket Connector

Longdex 3.5mm Stereo Panel Mount Jack 3PCS 3.5mm 1/8Inch Mini Female Stereo Panel Mount Solder Headphone Socket Connector

Product ID: 447358809

Details

Compatible Devices
Cellphone
Specific Uses For Product
Cell Phone MP3
Connector Type
Auxiliary
Colour
black
Item dimensions L x W x H
19 x 8 x 13

Description

Product Name:3.5mm Stereo Jack.Material:Plastic,Copper.
Voltage Rating:12V DC.Current Rating:1A.
Mounting:Panel Mount.Mounting Hole Diameter:8mm/0.31Inch.
Size: 19.2x9.5mm/0.76x0.34Inch(LxD).Quantity: 3 PCS.
This 3.5MM Female Stereo Panel Mount Jack Could Used for Mobile Phone,MP3/MP4 Player.

Product description Specifications: Product Name:3.5mm Stereo Jack Material:Plastic,Copper Voltage Rating:12V DC Current Rating:1A Contact Resistance:less than 50m Ohm Insulation Resistance:be equal or greater than100M Ohm Work Temperature: 25Degree Centigrade +85Degree Centigrade Pin Number:3Pins Size:19.2x10.2mm/0.76x0.40Inch(LxD) Mounting Hole Diameter:8mm/0.31Inch Mounting:Panel Mount Working Life:5000 Times Color:Black Quantity: 2 PCS

Specifications

ASIN	B0833WYLWQ
Batteries Included	No
Batteries Required	No
Brand	Popsunny
Compatible Devices	Cellphone
Customer Reviews	4.4 4.4 out of 5 stars (242)
Date First Available	16 March 2023
Generic Name	3.5mm audio cable
Item Dimensions LxWxH	19 x 8 x 13 Millimeters
Item Weight	18 g
Item model number	SPMJACK-3.5MM-2
Manufacturer	china
Material	Plastic
Model	SPMJACK-3.5MM-2
Number of Ports	3
Number of items	2
Product Dimensions	1.93 x 0.79 x 1.27 cm; 18 g
Standing screen display size	0.31 Inches

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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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