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Product Overview
The C28 Wireless Transmitter receiver is a compact adapter that lets you send or receive wireless audio through a 3.5 mm AUX connection. This guide is based strictly on the official documentation for the C28 Wireless Transmitter receiver, and it reflects the published steps and specifications in that leaflet-style manual. If you are adding wireless playback to an older device with an AUX port, the C28 can fill that gap without changing your main audio equipment.
In simple terms, RX mode is for receiving audio wirelessly from a phone into a wired speaker, car stereo, or other AUX input. TX mode is for transmitting audio wirelessly from a wired source into a wireless listening device. It uses a single multifunction button for power and basic playback control, plus a physical mode switch to choose RX or TX.
Best suited for:
- Adding wireless audio to an AUX-based speaker, car stereo, or similar device by using RX mode.
- Sending audio from an AUX source to a wireless device by using TX mode with automatic connection behavior after pairing.
- Short-range use in open areas where a roughly 10 m connection distance is realistic.
Consider alternatives if:
- You need long sessions without recharging, because the documentation lists about 4 hours of use time in receiver mode.
- You need reliable operation through walls or heavy obstructions, since the stated range assumes an open area without obstacles.
- You expect the adapter alone to improve sound quality, because the documentation notes audio quality depends on your connected equipment.
Note: The documentation describes the C28 as a converter and explains that perceived sound quality depends on the sound output of your source and playback devices.
What’s in the Box
The package includes the essentials needed to power the adapter and connect it to a standard AUX port, so you can start pairing right away without hunting for extra cables.
- C28 unit – the transmitter/receiver adapter with a mode switch, indicator light, and microphone opening.
- Charge cable – a micro USB cable used to charge the unit before use.
- 3.5 mm audio head – the AUX connector for linking the C28 to an audio device.
- User manual – the quick instruction sheet that lists modes, steps, and specifications.
How to Use the C28 Wireless Transmitter Receiver
To use the C28 Wireless Transmitter receiver, charge it first, plug it into your audio device with the 3.5 mm AUX connection, select RX or TX with the mode switch, then power it on with a long press of the Multifunction Button and complete wireless pairing from your phone or target device. The key is choosing the correct mode for whether the C28 should receive audio or send audio.
C28 wireless transmitter receiver user guide: controls and ports
The C28 has one main button and a few labeled connection points, and knowing these labels helps you follow pairing steps without guesswork. Use the Multifunction Button for power and basic playback control, use AUX in/out for the 3.5 mm connection, and use the TX/RX switch to set the operating role before pairing.
- Multifunction Button – power and play/pause control.
- AUX in/out – the 3.5 mm audio connection point.
- Transmitter/receiver switch – toggles between RX and TX.
- Indicator light – shows pairing and connection status described in the steps.
- Charging port – rated for 5V/1A charging input.
Receiver mode (RX): pair a phone to an AUX device
Receiver mode is used when your phone or tablet is the wireless audio source and your speaker, car stereo, or other playback device uses an AUX cable. Set the switch to RX before powering on so the C28 shows up as a wireless pairing target on your phone.
- Charge the C28 with the micro USB cable before first use.
- Connect the C28 to your audio device using the AUX cable.
- Move the mode switch to RX.
- Long-press the Multifunction Button to turn the device on and enter pairing readiness.
- On your phone, open wireless/Bluetooth search, select “C28,” and complete pairing.
Tip: If the C28 does not appear during search, confirm it is powered on and set to RX before retrying pairing.
Transmitter mode (TX): send AUX audio to a wireless device
Transmitter mode is used when your wired source is the audio origin and you want the audio to reach a wireless listening device. Set the switch to TX before powering on so the C28 behaves as the transmitter and can connect automatically after the target device is ready.
- Charge the C28 with the micro USB cable before use.
- Connect the C28 to your audio device using the AUX cable.
- Move the mode switch to TX.
- Long-press the Multifunction Button to turn the device on and enter pairing readiness.
- Turn on the device you want to connect; the C28 should connect automatically when pairing is successful.
Tip: Before you assume the C28 is not working, make sure the device you want to connect is powered on and ready to pair, since the documentation describes an automatic connection step.
Technical Specifications
These specifications help set expectations for range, battery behavior, and physical fit when you are placing the adapter near an AUX port or choosing where to use it.
| Specification | Value | What it means for use |
|---|---|---|
| Receiver mode lifetime | 4 h | Plan to recharge after a short listening session if you use it mainly in RX mode. |
| Battery capacity | 140 mA | Small built-in battery capacity aligns with the short stated runtime. |
| Working range | Up to 10 meters (open area, no obstacles) | Best results come from line-of-sight placement; walls and obstructions can reduce effective range. |
| Product size | 59.5 mm (L) x 22 mm (W) x 12 mm (H) | Compact footprint for tight spaces around car stereos, speakers, or TV AUX outputs. |
| Charging input | 5V/1A | Use a standard USB power source that matches this rating for charging compatibility. |
Troubleshooting
If the C28 is not pairing or audio does not sound right, the fastest fix is usually checking mode selection, power state, and connection distance. Use the table below to match what you see with likely causes and the most direct corrective steps supported by the official instructions.
| Problem | Cause | Solution |
|---|---|---|
| C28 does not show up in my phone’s wireless/Bluetooth list | The unit is not in RX mode or it is not turned on and ready for pairing. | Connect the AUX cable, set the switch to RX, then long-press the Multifunction Button and retry the phone’s wireless search for “C28.” |
| C28 will not connect to my wireless device in TX mode | The target device is not turned on or is not ready to pair, or the devices are too far apart for the stated open-area range. | Set the switch to TX, power on the C28, then turn on the target device and keep both within the stated 10 m open-area range to allow automatic connection. |
| Audio sounds bad or different than expected | The documentation notes sound quality depends on the sound effect of your connected equipment, since the C28 functions as a converter. | Test with a different source or playback device to isolate whether the issue comes from the connected equipment rather than the adapter. |
Next Steps
Now that you know how to switch between RX and TX and complete pairing, choose the mode that matches your setup and run a quick test at close range. If performance changes significantly with different devices, follow the documentation’s guidance and evaluate the audio output of your equipment. For unresolved questions, contact the manufacturer through the after-sales mailbox referenced in the official documentation.
How do I know when the C28 Wireless Transmitter receiver is ready to pair?
The manual states the indicator flashes quickly when the device is ready for pairing after you long-press the multifunction button. In RX mode it flashes blue, and in TX mode it flashes red.
Will the C28 connect automatically in transmitter mode?
Yes. In TX mode, after you turn on the device you want to connect, the documentation says the C28 will automatically connect when pairing succeeds. It also notes the wireless indicator illuminates red when the connection is successful.
Why does my audio quality change when I use the adapter?
The documentation describes the C28 as a converter and explains that sound quality depends on the sound effect of your own equipment. If results are not satisfactory, it recommends trying a different device to compare performance.
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