The UiiSii C1 Type-C Earphones combine a lightweight, exquisite arc design with powerful audio engineering. Designed with a semi-in-ear wearing method, the C1 effectively reduces pressure on the ear canal, making it the perfect choice for users who find traditional in-ear buds uncomfortable for long sessions. Driven by a 12mm large dynamic speaker, it delivers high-resolution sound with full bass and crystal-clear trebles, all transmitted losslessly through a modern Type-C digital interface.
Who Should Buy This
- Comfort Seekers: The semi-in-ear arc design is specifically shaped to fit the ear naturally, ensuring they stay secure without causing “ear fatigue” during long commutes or work hours.
- Bass Enthusiasts: Equipped with a 12mm dynamic driver and composite diaphragm for a rich, punchy “Heavy Bass” experience.
- Modern Smartphone Users: Plug-and-play compatibility for iPhone 15/16, Samsung, Xiaomi, and Google Pixel devices—no adapters required.
- Sensitive Skin Users: Features an extremely user-friendly TPE cable that is designed to be non-allergic and soft against the skin.
Real-World Performance
- Reduced Canal Burden: The semi-in-ear design allows for some ambient awareness while significantly reducing the “stuffed” feeling of standard earbuds.
- Tangle-Free TPE Cable: The 1.2m TPE cord is flexible, durable, and resists knotting in your bag or pocket.
- Universal Media Sync: Whether you are on a tablet, phone, or PC, the C1 provides consistent audio quality across all Type-C platforms.
Technical Specifications
| Brand | UiiSii |
| Model | C1 |
| Interface Type | USB Type-C |
| Driver Diameter | 12mm Dynamic Speaker |
| Frequency Range | 20 – 20,000Hz |
| Sensitivity | 110 ± 3dB |
| Cable Material | Skin-friendly TPE |
| Cable Length | 1.2 Meters |
| Controller | Intelligent Volume/Call/Music Control |
| Wearing Method | Semi-in-ear / Arc Design |
What’s in the Box
- 1 x UiiSii C1 Type-C Heavy Bass Earphones
Frequently Asked Questions
Does the volume control work on all Android phones?
The intelligent controller is designed to be compatible with most modern Type-C devices, though specific button functions can vary slightly by OS version.
Is this better for bass than the UiiSii CX?
Both feature 12mm drivers, but the C1 is specifically tuned for a “Heavy Bass” profile and features a semi-in-ear design for those who prefer less ear-canal pressure.
Can I use this for PC gaming?
Yes. As long as your PC or Laptop has a Type-C port that supports audio output, these will provide high-quality, low-latency sound.
Chanchal Chowdhury (verified owner) –
Shipping was incredibly fast.