USB-C to 3.5mm TRRS (CTIA) audio adapter in soft light-blue TPE, 3.5in long with a straight plug. Works with every SchoolPHONES® headphone and headset, and gives K6s, BKs, LPJ and LPJm models a USB-C plug for today’s Chromebooks, tablets and laptops. $4.90 each, or add one to any K6s, BKs, LPJ or LPJm order for $4.90. 10 and 50 packs available.
Brands: SchoolPHONES®
C1 – USB-C to 3.5mm TRRS Audio Adapter (CTIA standard) for SchoolPHONES® Headphones
Price range: $4.90 through $200.00
starting at
🔊 Crisp, Clear Audio
Consistent sound quality from student to student — tuned for speech and instructional content.
🎙️ SpringBoom™ Mic
Our flexible boom mic captures clear voice consistently — no more muffled recordings or failed assessments.
🛡️ No-Nonsense Warranty
Our headphones are built to last in schools. Every pair is backed by our no-nonsense warranty. View warranty details.
📦 Most orders ship within 1–3 business days
🛡️ No-nonsense 1 year warranty for BK/K6 models in 1:1 student use
🎧 One year warranty in lab & shared applications for LP models
Why Schools Trust Us
🔇 Volume-Limited
& Kid-Safe
🏫 Classroom
Durability Tested
🔧 Replaceable
Parts Available
�️ No-Nonsense
Warranty
🇺🇸 US-Based
Customer Support
✅ Trusted by
1000’s of Educators
Description
C1 USB-C to 3.5mm TRRS Audio Adapter: Keep Your Headphones in Service
The SchoolPHONES® C1 adapter turns the 3.5mm plug on any SchoolPHONES® headphone or headset into a USB-C plug. It was made for schools that own K6s, BKs, LPJ and LPJm headphones with a 3.5mm cable and are moving to Chromebooks, tablets and laptops that only have USB-C. Plug the headphone into the C1, plug the C1 into the device, and the headphones keep working. No new headphones, nothing goes to the landfill.
Key Features:
- USB-C to 3.5mm TRRS: straight USB-C plug on one end, 3.5mm (1/8in) TRRS socket on the other. Stereo sound and the microphone both pass through.
- CTIA* wiring: the same standard every SchoolPHONES® headset uses, so it works with all of our headphones and media headsets, and with most other CTIA/ASH headsets.
- Soft TPE body, 3.5in long: the flexible thermoplastic-elastomer body bends instead of cracking, and the short length keeps the strain off the device’s USB-C port.
- Light blue with the SchoolPHONES® logo: easy to spot in a classroom cart and easy to match to the headphones.
- Bundle price: $4.90 when added to a K6s, BKs, LPJ or LPJm headphone order. Pick it on the headphone’s page.
- Pack sizes: 1 pack $4.90, 10 pack $45.00, 50 pack $200.00.
Why Choose the C1 Adapter?
- Upgrade instead of replace: K6s, BKs and first-generation LPJ and LPJm headphones with a 3.5mm cable work on USB-C devices for a fraction of the price of new headphones.
- Protects the device: the adapter takes the plugging and unplugging, not the computer’s port.
- One adapter, every SchoolPHONES® product: compatible with the whole range, including the K6, BK, LP and LPJ series.
(*Cellular Telecommunications Industry Association)
Additional information
| Weight | 0.011 lbs |
|---|---|
| Dimensions | 3.5 × 0.5 × 0.3 in |
| Pack size | 1 Pack, 10 Pack, 50 Pack |
| Connector: | USB-C straight plug to 3.5mm (1/8in) TRRS socket |
| Wiring: | TRRS, CTIA standard |
| Material: | TPE (soft, flexible) |
| Length: | 3.5in (9cm) |
| Color: | Light blue, SchoolPHONES® logo |
| Works with: | All SchoolPHONES® headphones and headsets; made for K6s, BKs, LPJ and LPJm |
Why Schools Choose Us
Trusted by thousands of schools and districts across the country.
🎧
Built for Classrooms
Designed to withstand daily student use with reinforced cables and adjustable headbands.
�️
No-Nonsense Warranty
Every pair is backed by our straightforward warranty — because school gear should just work.
🔇
Volume-Limited & Safe
85dB volume limiting protects young ears during extended listening sessions and testing.
Need headphones for your whole school?
We offer the same pricing whether you buy one or one thousand — to support small schools and districts. If you need a quote or want to get us approved as a vendor, reach out!
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