The Portronics Conch Theta C (Black, model POR-2148) is a pair of wired in-ear earphones that plugs straight into a USB Type-C port, with 14.2mm dynamic drivers, an in-line microphone and in-line controls for volume, track skipping and calls. It is aimed at people whose phone has no 3.5mm headphone jack and who want simple, charge-free earphones for calls, classes, videos and music. If your phone, tablet or laptop has a USB-C port that supports audio accessories, it is a straightforward, inexpensive pick from a well-known Indian accessories brand.
The short verdict: a sensible everyday Type-C earphone with a large driver and a practical 1.2m tangle-resistant cable, held back by sparse published audio specs, a short 6-month warranty and the usual Type-C caveat that a few devices need a settings change before they recognise it.
This article is based on Portronics’ official product page and the Amazon.in listing for this exact Black variant, both checked on 17 October 2026. It is not based on hands-on testing, and we found no independent review to cite, so it makes no claims about how the Conch Theta C actually sound.
The Conch Theta C at a glance
- Good for: phones without a headphone jack, online classes, work calls and commuting
- Not ideal for: anyone who needs a 3.5mm plug, noise cancellation, water resistance or published frequency-response data
- Strengths: 14.2mm dynamic drivers, in-line mic and controls, 1.2m TPE anti-tangle cable, no charging needed
- Weaknesses: 6-month warranty, no published sensitivity or frequency range, some phones need OTG enabled, conflicting impedance figures across Amazon.in listings
Specifications
Specs below come from Portronics’ official page unless marked as listing-only.
| Item | Conch Theta C (Black) | Source |
|---|---|---|
| Model code | POR-2148 | Official page and listing |
| Type | Wired in-ear earphones | Official page |
| Connector | USB Type-C | Official page |
| Driver | 14.2mm dynamic | Official page |
| Microphone | Built-in in-line mic (HD Mic in the product name) | Official page |
| Controls | In-line: volume, track skip, calls | Official page |
| Cable | 1.2m TPE anti-tangle | Official page |
| Noise cancellation | None | Listing |
| Water resistance | Not water resistant | Listing |
| Box contents | 1 wired earphone | Listing |
| Warranty | 6 months | Official page and listing |
| Country of origin | China | Listing |
Check the current price of the Portronics Conch Theta C (Black) on Amazon.in
Will it work with your device? Read this first
This is the single most important question with any Type-C earphone, because unlike a 3.5mm plug, a USB-C connection is digital. The phone must either send audio through the USB-C port as an analogue signal, or the earphone needs its own small digital-to-analogue converter (DAC). Portronics does not say which approach the Conch Theta C uses, but its official page and the Amazon.in listing both carry the same note: if the earphones do not connect to your phone, open settings, search for “OTG” and enable the OTG connection option, then contact Portronics support if the problem continues. That advice suggests the phone has to recognise the earphones as a USB accessory.
In practice, here is how to think about compatibility:
- Recent Android phones with USB-C: the main target. If nothing plays, look for an OTG toggle in settings, as Portronics advises. On some phones the OTG setting may switch itself off after a while, so check it again if the earphones stop working.
- iPhones with USB-C: Portronics does not mention iPhone specifically, so treat iPhone compatibility as unconfirmed and keep the return window in mind.
- Tablets and laptops: Portronics lists tablets and laptops as compatible Type-C devices. On a laptop, you may need to choose the earphones as the audio output and microphone in sound settings.
- Phones with only a 3.5mm jack or micro-USB: this earphone will not plug in. You need a 3.5mm model instead.
The listing’s compatible-devices field only says cellphones, while the official page and listing bullets mention tablets and laptops too. The wider claim comes from Portronics itself, so it is reasonable to expect it to work on most USB-C devices that support audio accessories.
Sound and the 14.2mm driver
Portronics says the 14.2mm drivers deliver powerful, rich and clear audio. A 14.2mm driver is large for an in-ear design, and larger drivers are generally chosen to give a fuller, more bass-forward sound. Driver size alone does not tell you how a pair is tuned, though, and Portronics does not publish frequency response or sensitivity figures.
Impedance is a good example of why to be cautious with listing data. The Amazon.in listing for this Black variant gives 3.99 ohms, while the listing for the White variant of the same model gives 45 ohms, and Portronics’ own page lists no impedance at all. Since both cannot describe the same product, we have left impedance out of the spec table. For a Type-C earphone it matters less anyway, because the Conch Theta C’s USB audio output or the earphone’s own circuitry handles the power.
Design, fit and cable
Portronics describes the earbuds as a unique design that is comfortable to wear for long sessions, and the listing gives thermoplastic elastomer (TPE) as the material. Neither source says how many ear-tip sizes are included, and the listing’s box contents field mentions only the earphone itself. With in-ear designs, a good seal affects both comfort and bass, so if the fit feels loose, trying different tips (if included) or a third-party set of the right size is worth the effort.
The 1.2m TPE cable is described as anti-tangle. TPE is a soft, flexible material widely used for tangle-resistant earphone cables. A 1.2m length suits pocket and desk use, and is long enough to reach a laptop on a table.
Calls and in-line controls
The in-line remote combines a microphone with buttons that, according to Portronics, let you adjust volume, skip tracks and answer calls. Portronics does not list the exact button layout or functions such as voice-assistant activation, so expect to check the leaflet or experiment. On laptops, volume and play controls may behave differently from phones depending on the operating system.
Wired mics like this sit near your mouth on the cable, which often helps clarity compared with distant laptop microphones. Portronics calls it an HD mic but publishes no microphone specifications, and the listing confirms there is no noise cancellation, so background noise will travel with your voice.
Who should buy it, and who should not
- Buy it if your phone has USB-C and no headphone jack, you want earphones that never need charging, and you mainly use them for calls, classes, YouTube and casual music.
- Buy it if you want a long cable for desk use and in-line controls without reaching for your phone.
- Skip it if you need a 3.5mm plug, sweat or water resistance, or active noise cancellation.
- Skip it if you want a longer warranty, published audio measurements or confirmed iPhone support.
Alternatives to compare
Other Type-C wired options worth a look, with facts taken from their official page or Amazon.in listing.
- OnePlus Half In-Ear Wired Earphones Lite (MH136): also uses a 14.2mm dynamic driver and Type-C, but with a half-in-ear shape that sits in the outer ear rather than sealing the canal, plus a one-button remote and, per its listing, a 1-year warranty.
- HAMMER Nova 2: HAMMER’s official page lists USB Type-C, 13mm drivers, an in-line HD mic, a multi-function button for playback, calls and voice assistant, and metal earbuds.
- Sennheiser CX 80U: according to its Amazon.in listing, a USB Type-C earphone with an in-line microphone, one-button control and three ear-tip sizes, from a specialist audio brand.
- pTron Boom Play X5: its listing describes 10mm drivers, an HD mic, in-line controls, a 1.2m TPE cable, S/M/L ear tips and connectors for both Type-C and 3.5mm, useful if you switch between old and new devices.
Before you order: a quick checklist
- Confirm the variant: this link is for the Black colour, model POR-2148. Portronics also offers the Conch Theta C in White (POR-2749) and Orange (POR-3326), which this link does not cover, so check the colour shown before you buy.
- Check your port: make sure your device has USB-C, not micro-USB or Lightning.
- Know the OTG step: if there is no sound, enable OTG in your phone’s settings before assuming a fault.
- Warranty and support: both sources state 6 months. The listing gives help@portronics.com and +91 9555-245-245 for support. Keep your invoice.
- Return window: if you use an iPhone or an unusual tablet, test it promptly so you can return it within Amazon.in’s window if it does not work.
See the Conch Theta C Black variant on Amazon.in
Setup and care tips
- Plug the connector in fully and wait a second or two for the phone to detect the accessory before playing audio.
- If audio still plays from the speaker, check that OTG is on and reconnect, as Portronics advises.
- On a laptop, select the earphones as both output and input in sound settings before joining a video call.
- Wrap the cable loosely rather than tightly around a phone, and avoid pulling the plug out by the cable.
- Wipe the earbuds with a dry cloth and keep them away from water, since the listing says they are not water resistant.
Frequently asked questions
Does the Portronics Conch Theta C have a microphone?
Yes. Portronics lists a built-in in-line microphone with controls for calls, volume and track changes.
Why is my phone not detecting the Conch Theta C?
Portronics says to open your phone’s settings, search for OTG and enable the OTG connection option. If that does not fix it, contact Portronics customer support.
Does it work with a 3.5mm headphone jack?
No. It has a USB Type-C connector only. Use a 3.5mm earphone, or one with both connectors, for older devices.
What warranty does the Conch Theta C come with?
Both Portronics’ official page and the Amazon.in listing state a 6-month warranty.
Is the Black version different from the White version?
Portronics lists them as colour options of the same Conch Theta C with different product codes (POR-2148 for Black and POR-2749 for White). Their Amazon.in listings show different impedance figures, which we could not confirm with Portronics, so we treat the colours as the same product.
Bottom line
The Portronics Conch Theta C is a no-fuss Type-C earphone with a large 14.2mm driver, an in-line mic and a practical 1.2m cable. It suits everyday calls and media on modern phones, as long as you are comfortable with a 6-month warranty and the possibility of toggling OTG. If you need a 3.5mm plug, noise cancellation or a longer warranty, look at the alternatives above.
Check the current price of the Portronics Conch Theta C on Amazon.in
Related reading on GadgetSoch: GOBOULT WiredX 500 Review: USB-C Wired Earphones With Mic and IPX5, Explained and realme Buds 3 Wired Review (RMA2419): 3.5mm Earphones With Mic, Specs and Limits.
Sources
- Portronics official product page: Conch Theta C Type-C Wired Earphones with HD Mic (checked 17 October 2026)
- Amazon.in listing for Portronics Conch Theta C Black, ASIN B0DGLQHBF9 (checked 17 October 2026)
- Amazon.in listing for Portronics Conch Theta C White, ASIN B0DDHM6D3L (impedance cross-check, checked 17 October 2026)
- HAMMER official product page: Nova 2 (checked 17 October 2026)
- Amazon.in listings for OnePlus MH136, Sennheiser CX 80U and pTron Boom Play X5 (alternative facts, checked 17 October 2026)
