Bluetooth Dongle

Key Features

• USB Bluetooth audio receiver

• Bluetooth 4.0 + EDR

• A2DP stereo audio support

• Up to 3 Mbps published transmission rate

• Up to approximately 30ft / 10m wireless range

• USB 2.0 interface

• USB 5V powered

• No external battery required

• Built-in microphone

• Hands-free calling support

• Plug-and-play operation with compatible audio systems

• Compact portable design

• Suitable for compatible car stereos

• Suitable for compatible USB speaker systems

• Wireless music streaming from smartphones

Technical Specifications

Bluetooth Function

The dongle operates as a:

Bluetooth Audio Receiver

The signal path is:

Bluetooth Smartphone / Audio Source

↓

Bluetooth Wireless Connection

↓

USB Bluetooth Receiver

↓

Compatible Car Stereo / Speaker System

Power System

The receiver obtains power directly from:

5V USB

No separate:

• Battery

• Charger

• External DC supply

is required.

Wireless Range

Published maximum range:

Up to approximately 10 metres / 30 feet

under favourable unobstructed conditions.

Actual range can vary because of:

• Walls

• Vehicle construction

• Metal surfaces

• Wireless interference

• Device placement

• Bluetooth source device

Important USB Compatibility

A physical USB port alone does not guarantee compatibility.

The connected audio system must support the type of USB audio/media functionality required by this receiver.

A USB port intended only for charging may power the dongle but may not provide audio playback.

Compatibility

This product is intended for compatible:

• Car stereos

• Car audio systems

• USB-enabled speakers

• Multimedia speaker systems

• Home audio systems with compatible USB playback

• Other compatible USB audio devices

Bluetooth Source Compatibility

The receiver can pair with compatible Bluetooth audio-source devices such as:

• Android smartphones

• iPhones

• Tablets

• Bluetooth-enabled laptops as audio sources

• Other Bluetooth music-source devices

Important — Check Your USB Port

For this dongle to work correctly, the connected speaker or car stereo must provide the required USB media/audio functionality.

A USB connector can have different purposes.

For example:

USB Media/Playback Port → Potentially Compatible

USB Charge-Only Port → May Power the Dongle but Audio May Not Work

Therefore, check the audio system's USB functionality before purchase.

Important — Not a PC Bluetooth Adapter

This product should not be purchased as a conventional PC Bluetooth dongle.

It is not intended to add general Bluetooth functionality to a computer operating system for:

• Bluetooth mouse

• Bluetooth keyboard

• Bluetooth printer

• Bluetooth file transfer

• General Windows Bluetooth connectivity

For those applications, use a dedicated PC USB Bluetooth adapter with appropriate operating-system support.

Speaker Compatibility

The product does not directly drive a passive speaker.

It requires a compatible powered audio system such as:

• Active speaker

• Car stereo

• Powered multimedia speaker

• Compatible audio player/amplifier system

Hands-Free Calling

The current product specification includes a:

Built-in Microphone

for hands-free calling functionality with compatible systems.

Actual calling behaviour can depend on the connected audio system and Bluetooth device.

Required for Operation

You generally need:

• USB Bluetooth receiver

• Compatible USB audio system

• Bluetooth-enabled smartphone or audio source

No separate battery is required.

Before Purchase

Bluetooth: 4.0 + EDR

Purpose: Bluetooth Audio Reception

USB: USB 2.0

Power: USB 5V

Range: Up to approx. 10m

Microphone: Built in

PC Bluetooth Adapter: No

Passive Speaker Driver: No

Battery: Not required

Applications

• Car Bluetooth music streaming

• Wireless car audio

• Compatible speaker upgrades

• Multimedia speaker systems

• Smartphone-to-speaker streaming

• Wireless music playback

• Older audio-system upgrades

• Hands-free audio applications

• Portable wireless audio setups

Suitable For

• Car owners

• Home audio users

• DIY audio enthusiasts

• Electronics hobbyists

• Users upgrading older compatible speaker systems

📦 What's Included

❌ What's Not Included

The standard package does not include:

• Smartphone

• Speaker

• Car Stereo

• USB Extension Cable

• USB Charger / Adapter

• Power Bank

• 3.5mm AUX Cable

• External Microphone

• PC Bluetooth Driver

• PC Bluetooth Adapter

Important Purchase Note

This product is a:

Bluetooth Audio Receiver

It is designed to receive Bluetooth audio from a compatible source and provide it to a compatible USB audio system.

It is not a conventional PC Bluetooth adapter.

No Battery Required

The receiver is powered directly through:

5V USB

Therefore, no separate rechargeable battery or charging cable is required.

Product Variation

Housing colour, LED position, internal chipset, printed markings and minor external details may vary between manufacturing batches while maintaining the intended Bluetooth audio-receiver functionality.

Getting Started

Step 1 — Check Your Audio System

Before using the dongle, confirm that your speaker or car stereo has a compatible USB media/audio port.

A charge-only USB port may not work for audio.

Step 2 — Insert the Bluetooth Receiver

Plug the receiver into the compatible USB port.

The receiver obtains its operating power directly from:

5V USB

Step 3 — Wait for the Indicator

The onboard LED should indicate that the receiver is powered and ready for pairing.

Indicator behaviour can vary between manufacturing revisions.

Step 4 — Enable Bluetooth

On your smartphone or other Bluetooth audio source:

1. Open Bluetooth settings.

2. Enable Bluetooth.

3. Search for nearby devices.

Step 5 — Select the Receiver

Select the available Bluetooth audio receiver from the device list.

The exact Bluetooth device name can vary between manufacturing batches.

Step 6 — Pair the Device

Complete the Bluetooth pairing process.

If a passkey is requested, refer to the pairing information supplied with the specific receiver revision.

Do not assume a fixed pairing code unless required by the actual unit.

Step 7 — Start Music Playback

Open your preferred music or audio application and begin playback.

Audio should be transmitted:

Phone

↓

Bluetooth

↓

USB Bluetooth Receiver

↓

Compatible Audio System

Step 8 — Adjust Volume

If the output is too low, check both:

• Smartphone/source volume

• Car stereo/speaker volume

Adjust gradually to the required level.

Step 9 — Hands-Free Calling

The receiver includes a built-in microphone.

When supported by the connected system and paired device, it can provide hands-free calling functionality.

Basic Setup

Smartphone

↓

Bluetooth 4.0 Wireless Audio

↓

USB Bluetooth Receiver

↓

Compatible Car Stereo / Speaker

No Separate Power Supply Required

The dongle receives:

5V power directly from USB

so no external battery or separate power adapter is required when used with a powered compatible USB port.

Troubleshooting Compatibility

If the receiver powers on but no audio is heard:

1. Confirm Bluetooth pairing.

2. Check source volume.

3. Check audio-system volume.

4. Verify that the USB port supports media/audio functionality.

5. Confirm the correct audio mode is selected on the car stereo or speaker.

A glowing LED only confirms that the receiver has power; it does not guarantee that the USB host supports the required audio functionality.

🔧 Prototyping and Engineering Tips from RoboGears

1. Check USB Compatibility Before Purchase

This is the most important consideration.

Not every USB port on a speaker, amplifier or car stereo supports audio/media playback.

A charge-only USB port may power the receiver without producing audio.

2. This Is Not a Normal PC Bluetooth Dongle

Do not use this product when the requirement is to add general Bluetooth connectivity to Windows or another operating system.

For example, it is not intended for connecting:

• Bluetooth mouse

• Bluetooth keyboard

• Game controller

• Printer

• Other Bluetooth peripherals

Use a dedicated PC Bluetooth adapter for those applications.

3. Understand the Signal Direction

This device is primarily a:

Bluetooth Receiver

The normal signal direction is:

Phone → Bluetooth Receiver → Audio System

It should not be assumed to operate as a Bluetooth transmitter.

4. Keep the Receiver Exposed

For better Bluetooth performance, avoid placing the receiver deep inside:

• Metal cabinets

• Enclosed dashboards

• Shielded compartments

Metal can reduce wireless range.

5. Published Range Is a Maximum

The published wireless range is approximately:

10m / 30ft

under favourable conditions.

Actual range can be lower in vehicles and indoor environments.

6. Check Both Volume Controls

If playback volume is low, check:

• Smartphone volume

• Audio-system volume

Both can affect the final listening level.

7. USB Power Quality Can Matter

Electrical noise from a poor-quality USB power source can affect audio equipment.

For best results, use the receiver with a properly functioning USB port.

8. Test Before Permanent Installation

Before routing cables or installing the receiver permanently, test:

• Bluetooth pairing

• Music playback

• Range

• Volume

• Calling functionality if required

9. Microphone Placement Matters

If hands-free calling is required, avoid installing the dongle where its microphone is heavily obstructed.

For example, placing it deep inside a closed compartment can reduce voice pickup.

10. Don't Confuse Receiver and Transmitter Functions

A receiver accepts wireless Bluetooth audio.

A transmitter sends audio to Bluetooth headphones/speakers.

This product should be purchased for Bluetooth audio reception, not assumed to provide both functions.

Troubleshooting

Dongle Powers On but No Audio

The most common compatibility issue is a USB port that supplies power but does not support the required audio/media functionality.

Check the audio system's USB specifications.

Phone Cannot Find the Receiver

Try:

• Turning Bluetooth off and on

• Disconnecting other paired devices

• Moving closer to the receiver

• Reconnecting USB power

• Searching again

Audio Keeps Cutting Out

Check:

• Distance

• Metal obstruction

• Wireless interference

• Phone position

• USB connection

Audio Is Too Low

Increase:

• Phone/source volume

• Audio-system volume

gradually.

Calls Work Poorly

Check whether:

• The connected system supports the required call functionality

• The microphone is obstructed

• The receiver is too far from the user

PC Does Not Recognize It as a Bluetooth Adapter

This is expected.

The product is intended as a Bluetooth audio receiver, not a general-purpose Bluetooth adapter for the computer operating system.

Engineering Principle

For this type of receiver, successful operation depends on:

Bluetooth Source + Receiver + Compatible USB Audio Host + Audio System

The presence of a physical USB socket alone does not guarantee compatibility.

FAQ

1. What is this Bluetooth dongle?

It is a compact USB Bluetooth audio receiver designed to add wireless music streaming to compatible car stereos and speaker systems.

2. Which Bluetooth version does it use?

The current RoboGears product specification states:

Bluetooth 4.0 + EDR

3. What is the wireless range?

Published range:

Up to approximately 30ft / 10m

under favourable unobstructed conditions.

4. What is the transmission rate?

Published transmission rate:

Up to 3 Mbps

5. How is it powered?

The receiver obtains power directly from:

5V USB

6. Does it have a battery?

No external battery is required.

It operates from USB power.

7. Does it need charging?

No separate charging process is required when the receiver is powered from a compatible USB port.

8. Does it have a microphone?

Yes.

The current RoboGears specification lists a built-in microphone.

9. Does it support hands-free calling?

The current product specification states that hands-free calling is supported.

Actual functionality can depend on the connected audio system and paired device.

10. Can I use it in my car?

Yes, if the car stereo's USB port provides the compatible media/audio functionality required by the receiver.

11. Will it work in every car USB port?

No.

Some USB ports provide power only.

The stereo must support compatible USB media/audio operation.

12. Can I use it with speakers?

Yes, with compatible powered speaker systems that support the required USB functionality.

13. Can it directly drive a passive speaker?

No.

It is an audio receiver, not a power amplifier.

A passive speaker requires an amplifier.

14. Can I use it with Android?

Yes, as a Bluetooth audio source.

15. Can I use it with an iPhone?

Yes, as a Bluetooth audio source.

16. Can I stream music from my phone?

Yes.

Wireless music streaming is the primary purpose of the receiver.

17. Can I use it as a Bluetooth adapter for my PC?

No.

This product is not intended to add general Bluetooth functionality to a computer operating system.

18. Can I connect a Bluetooth mouse through it?

No.

Use a dedicated PC Bluetooth adapter instead.

19. Can I connect a Bluetooth keyboard through it?

No.

This is an audio receiver.

20. Can I use it for Bluetooth file transfer?

No.

It is intended for Bluetooth audio reception.

21. Is it a Bluetooth transmitter?

It should not be assumed to provide transmitter functionality.

Its intended function is:

Bluetooth Audio Receiver

22. Does it support stereo music?

The current RoboGears listing specifies:

A2DP stereo audio support

23. Is installation required?

No software installation is normally required when using the receiver with a compatible audio system.

It is designed for plug-and-play operation.

24. Why does the LED turn on but no music play?

The USB port may be providing 5V power without supporting the required audio/media functionality.

Check the audio system's USB capabilities.

25. Does it require an AUX cable?

The exact RoboGears product is intended to operate through a compatible USB audio/media interface.

An AUX cable is not specified as required or included for this exact product.

26. What is included in the package?

1 × USB Bluetooth 4.0 Audio Receiver Dongle with Built-in Microphone

27. Can I use it with a power bank?

A power bank can provide USB power, but power alone does not provide an audio connection to a speaker.

The receiver still requires a compatible audio-system interface for playback.

28. Can I use it with a USB wall charger?

A wall charger can provide power, but it does not by itself provide the required audio path.

29. Is the Bluetooth device name fixed?

The Bluetooth pairing name may vary between manufacturing revisions.

Check the available Bluetooth devices after powering the receiver.

30. What should I check before buying?

Confirm that you need a:

USB Bluetooth Audio Receiver

and that your intended car stereo or speaker supports compatible USB media/audio functionality.

If you need Bluetooth connectivity for a PC, keyboard, mouse or file transfer, choose a dedicated computer Bluetooth adapter instead.

Important Note

This product is specifically intended for wireless audio reception.

Compatibility depends on the USB functionality of the connected audio system. A USB port that only supplies 5V power does not guarantee audio compatibility.

Disclaimer

Bluetooth range depends on environmental conditions, interference, obstacles and the connected device.

Housing colour, Bluetooth pairing name, LED behaviour, internal chipset and minor construction details may vary between manufacturing batches while maintaining the intended Bluetooth audio-receiver functionality.