ASUS USB-BT540 Bluetooth 5.4 USB Adapter - Up to 7 Devices
ASUS
ASUS USB-BT540 Bluetooth 5.4 USB Adapter - Up to 7 Devices
The ASUS USB-BT540 Bluetooth 5.4 USB Adapter is a compact dongle designed for desktop and laptop users who want to add or upgrade Bluetooth connectivity without occupying much space. It supports simultaneous connections to up to 7 Bluetooth devices and includes the LC3 codec for more energy-efficient audio. The ultra-small form factor makes it easy to leave plugged in permanently or carry between machines.
Why this product
Bluetooth 5.4 with Low Energy support
It uses the latest Bluetooth 5.4 standard, covering both classic Bluetooth (BDR/EDR) and Bluetooth Low Energy (BLE) for broad device compatibility and reduced power draw.
Connect up to 7 devices at once
Up to 7 Bluetooth smart devices can be paired and active simultaneously, so keyboards, mice, headphones and more can all stay connected.
LC3 codec for efficient audio
The LC3 codec delivers a higher-quality audio experience while reducing device power consumption by approximately 50% compared to standard codecs.
Extended BLE range up to 40 metres
In open space, BLE range reaches up to 40 metres, while classic Bluetooth covers up to 10 metres — a meaningful step up from older Bluetooth 4.x adapters.
Ultra-small, travel-ready design
At 1.9 g and just 14.9 × 17.4 × 7.1 mm, it barely protrudes from a USB port and is easy to carry between machines.
- Bluetooth VersionBluetooth 5.4
- InterfaceUSB 2.0 Type-A
- Max Devices7
- Classic BT RangeUp to 10 m (open space)
- BLE RangeUp to 40 m (open space)
- OS SupportWindows 10/11, Linux
- Weight1.9 g
- SKUASU-4151
- EAN4711387765838
- Works with Windows 10 and Windows 11
- Works with Linux
- Connects via USB 2.0 Type-A — fits any full-size USB-A port
- macOS is not listed in the supported operating systems; verify compatibility before purchase
- BLE range of up to 40 metres and classic BT range of up to 10 metres are measured in open space; walls and interference will reduce these figures
- Does not fit USB-C only ports without a separate adapter
Best for
- Desktop PC users adding Bluetooth for the first time or upgrading from an older adapter to Bluetooth 5.4.
- Multi-device users who need up to 7 Bluetooth peripherals — keyboard, mouse, headset and more — connected at the same time.
- Wireless audio listeners who want LC3 codec support for more efficient, higher-quality Bluetooth audio.
- Frequent travellers who need a near-invisible, 1.9 g adapter that can stay plugged in or slip into a pocket.
Trade-offs
- macOS users — the adapter lists only Windows 10/11 and Linux as supported operating systems.
- High-bandwidth data transfers — maximum classic Bluetooth data rate is 3 Mbps, which is lower than Wi-Fi-based transfer solutions.
- USB-C only machines — the connector is USB 2.0 Type-A and will not fit without an additional adapter.
- Long-range classic Bluetooth applications — classic BT range tops out at 10 metres in open space.
Your ultimate solution for wireless connectivity
The USB-BT540 features the latest Bluetooth 5.4 technology, allowing you to connect up to 7 Bluetooth smart devices simultaneously. Enjoy faster connections, connect more devices, and extend your range like never before!
High quality, Unparalleled Efficiency
The USB-BT540 features LC3 codec, allowing listeners to enjoy a more energy-efficient and high-quality audio experience, while significantly reducing device power consumption by about 50%.
Farther, faster!
Compared to adapters using Bluetooth 4.X, the USB-BT540 significantly boosts data transfer speed and range.
General
| Brand | ASUS |
|---|---|
| Model | USB-BT540 |
| OS Support | Windows 10/11, Linux |
Connectors
| Connector | USB 2.0 Type-A |
|---|---|
| Bluetooth Standard | Bluetooth 5.4, Bluetooth Classic (BDR/EDR), Bluetooth Low Energy (BLE) |
| Frequency Band | 2402–2480 MHz |
| Spectrum | FHSS (Frequency Hopping Spread Spectrum) |
| Modulation | GFSK for 1M/2 Mbps; π/4-DQPSK for 2 Mbps; 8-DPSK for 3 Mbps |
Performance
| Data Rate (Classic BT) | Up to 3 Mbps |
|---|---|
| Data Rate (BLE) | Up to 2 Mbps |
| Range (Classic BT) | Up to 10 m (open space) |
| Range (BLE) | Up to 40 m (open space) |
| Max Simultaneous Devices | 7 |
Physical
| Dimensions | 14.9 × 17.4 × 7.1 mm |
|---|---|
| Weight | 1.9 g |
| Package Contents | Bluetooth 5.4 USB Adapter, Quick Start Guide, Warranty Card |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.