ASUS Bluetooth 4.0 USB Adapter USB-BT400

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Manufactured by ASUS

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checkthe good
  • fairly cost-effective product
  • ability to connect with multiple electronic gadgets
  • backwards-compatible Bluetooth 4.0 adapter
close the bad
  • requires a learning process due to installation of software
  • connection problems can occur even within the recommended 10m radius
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ASUS USB Adapter with Bluetooth (USB-BT400)
ASUS USB Adapter with Bluetooth (USB-BT400)
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ASUS USB Adapter with Bluetooth (USB-BT400)

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  • CURRENT PRICE $21.31
  • LOWEST PRICE $21.31
  • HIGHEST PRICE $40.38

ASUS Bluetooth 4.0 USB Adapter USB-BT400 Review

Key features

  • Advanced Bluetooth 4.0 that is compatible backwards with Bluetooth 2.0/2.1/3.0
  • Ultra-small design of high portability
  • Bluetooth Low Energy technology facilitates energy-efficient wireless connectivity


The ASUS USB-BT400 offers both new and advanced Bluetooth 4.0 functions and enables wireless connectivity with an enormous range of electronic gadgets.  It measures 19.47 x 16 x 8.1 mm in terms of Width by Depth by Height. The wireless network card has a free-space allowance of more than 10 meters for usage. It carries a standard Bluetooth V4.0 and USB 2.0, with its frequency band lying between 2.4 and 2.4835GHz. As well, the card supports 32-bit and 64-bit Windows XP, 7 and 8 series operating systems. 

What is the overall performance ?

ASUS USB-BT400 requires some slight learning curve for smooth operation. Installation can be done successfully by downloading the install package from the mother website or using the CD provided. One has to first install the software, before plugging in the adapter as directed. Expect to undertake successful pairing afterwards with a suitable device.

This tiny dongle offers some good range of usage. It means you can enjoy walking flexibility almost anywhere within the home or office up or downstairs, without losing the signal or experiencing any break-ups. Its performance is amazing when compared to an on-board version of ASUS Bluetooth, which can reach around 15 feet of signal strength. It is important noting that Bluetooth is yet an imperfect technology and faces its own challenges especially when broadcasting sound.

But let's remember, this is Bluetooth, an imperfect technology, IMO, especially when broadcasting sound. Pitch fluctuations occur when listening to headphones via Bluetooth broadcast when connected to Android gadgets or Windows PC. This happens mostly as the user moves further away from source, which can be a disappointing reality. While this could vary with different types of headphones, you can expect some slight processing/grinding hum in the right headphone, especially when listening to quieter forms of music.


ASUS Bluetooth 4.0 USB Adapter USB-BT400 comes with a full array of useful features. It includes new-generation Bluetooth 4.0 that offers versatile wireless connectivity. Being a Bluetooth Smart Ready USB adapter, the USB-BT400 connects the user with multiple compatible gadgets. As well, it cuts down on power-consumption as it supports Bluetooth Low Energy (BLE). The wireless network card maintains full backward-compatibility in dual mode with Bluetooth 3.0, 2.1, as well as 2.0.

The ASUS Bluetooth 4.0 USB Adapter USB-BT400 is an amazing wireless network card that offers effective communication between various electronic gadgets. It also comes at an affordable price considering the features you get in return.

  • The Good :
    fairly cost-effective product, ability to connect with multiple electronic gadgets, backwards-compatible Bluetooth 4.0 adapter
  • The Bad :
    requires a learning process due to installation of software, connection problems can occur even within the recommended 10m radius
Our score:
4 / 5

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Product Description

  • The ASUS Bluetooth 4.0 USB Adapter USB-BT400 is manufactured by ASUS and was added in December 2014 in the Wireless Network Card section
  • This product has a rating of 4.0 out of 5
  • The best price of the ASUS Bluetooth 4.0 USB Adapter USB-BT400 in Australia is $21.31 at Amazon Australia
  • In Australia this product is available in Sydney, Melbourne, Brisbane
  • You can find this product at Amazon Australia

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