Good Connections GC-M0042 — SmartFLEX 3.5 mm Stereo Jack Cable, 3 m, Dark Blue
3.5 mm TRS3 mGold-platedDark blue
The Alcasa Good Connections GC-M0042 is a 3 m stereo audio cable with a 3-pole 3.5 mm jack plug on both ends, for connecting phones, laptops, PCs and media players to active speakers, a car AUX input, an amplifier or headphones with a detachable cable.
It is built for clean, durable connections: full-metal plug housings with 24K gold-plated contacts, oxygen-free copper conductors and double shielding against hum and interference. The SmartFLEX PVC jacket (3.8 mm) is flexible and resists curling, so the cable lies flat on a desk or along a car console.
Before you order: This is a 3-pole (TRS) stereo cable. It carries left and right audio only — it will not carry the microphone of a headset, which needs a 4-pole (TRRS) cable.
What's in the Box
- 1 × Good Connections SmartFLEX audio cable, 3.5 mm jack plug to 3.5 mm jack plug, 3 m, dark blue
What It Means in Practice
- Play music from a phone or laptop through active speakers, a soundbar AUX input or a hi-fi amplifier.
- Connect a phone to the car stereo AUX socket.
- 3 m reaches comfortably from a desk to floor-standing speakers or across a small room.
- Straight plugs at both ends; slim metal housings fit most phone cases.
What Will Not Work
- It will not carry a headset microphone or in-line remote (needs 4-pole TRRS).
- It will not connect to phones without a 3.5 mm socket unless you add a USB-C or Lightning audio adapter.
- It is not a 6.35 mm (1/4") jack or RCA cable — adapters are needed for those inputs.
- It carries analogue audio only, not digital optical or HDMI audio.
Key Features
Gold-plated plugs
24K gold-plated contacts in full-metal housings.
OFC conductors
99.9% oxygen-free copper.
Double shielding
Reduces hum and interference on longer runs.
SmartFLEX jacket
Flexible PVC, 3.8 mm diameter, resists curling.
Technical Specifications
| Identification |
| Part Number |
GC-M0042 |
| EAN / GTIN |
4014619718498 |
| Brand |
Alcasa (Good Connections) |
| Connectivity |
| Connector 1 |
3.5 mm jack plug, 3-pole (stereo TRS), male |
| Connector 2 |
3.5 mm jack plug, 3-pole (stereo TRS), male |
| Plug style |
Straight, full-metal housing |
| Contacts |
24K gold-plated |
| Physical |
| Length |
3 m |
| Conductor |
Oxygen-free copper (OFC, 99.9%) |
| Shielding |
Double shielded |
| Jacket |
Flexible PVC (SmartFLEX) |
| Cable diameter |
3.8 mm |
| Colour |
Dark blue |
| Warranty |
| Warranty |
1-Year Warranty (Singular) |
| Manufacturer Term |
Manufacturer warranty term not published — claims handled through Singular |
Frequently Asked Questions
Will it work with my gaming headset microphone?
No. This is a 3-pole stereo cable; headset microphones need a 4-pole (TRRS) cable.
Can I use it with an iPhone or USB-C phone?
Yes, with a USB-C or Lightning to 3.5 mm audio adapter between phone and cable.
Does a 3 m length reduce sound quality?
Not noticeably for line-level and headphone audio; the double shielding helps keep noise down.
Singular Expert Insight · Buyer's Guide
A well-shielded 3.5 mm cable is the simplest way to get sound from a phone or PC into speakers or a car stereo without Bluetooth delays. If you are tidying up a desk setup,
our cable range also covers the network and video leads around it.
✓ Buy it if you need a durable 3 m stereo link between a 3.5 mm output and a 3.5 mm input.
✕ Skip it if you need a headset microphone (TRRS), RCA or 6.35 mm connections.
→ Also consider a shorter 2 m version for desk use, or a 3.5 mm to RCA cable for hi-fi amplifiers.
Not sure it fits your setup? Send us the model of your rack, switch or device and we will check compatibility before you order.