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AZiO BTD-V401 USB USB Micro Bluetooth Adapter (V4.0 EDR + aptX)

  • USB
  • Bluetooth 4.0
  • Up to 3.0Mbps Transfer rate
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Learn more about the AZIO Corporation BTD-V401




Bluetooth Standards
Bluetooth 4.0
Transfer rate
Up to 3.0Mbps
Operating Systems Supported
Windows XP, Vista, 7, 8
22.1mm x 14.9mm x 7.5mm (L x W x H)


Radio: Class 2
Bluetooth Profiles: A2DP (w/ aptX), GAP, SPP, DUN, FAX, LAP, OPP, FTP, HSP, AVRCP, SYNCH

A2DP with aptX Support

Bluetooth Version 4.0 + EDR

Low Energy Consumption Protocols

Ultra-Compact Design

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the AZIO Corporation BTD-V401

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  • Brandon A.
  • 10/30/2014 10:22:41 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year

4 out of 5 eggsWorks well

Pros: - Very small
- Uses standard reference CSR Harmony drivers with no aftermarket modifications
- Has connected every device I've tried (Nexus 7 2012, Nexus 7 2013, Moto X, 2 keyboards)
- Can set profiles and names for each device.
- Good range (see Other below for details)
- Blinking LED when powered.

Cons: - Will not restart Bluetooth driver interface when device it hot-plugged. If I move the adapter, the Bluetooth icon disappears until I reboot.
- CSR drivers have little documentation as to what all the terms mean.
- Must set a profile for a tablet first, before you can "connect" after pairing. Not documented.
- Not a real user friendly install. It's not "guided" to show you how to keep the adapter powered when the PC is in standby, or how to go about pairing something. "Not for noobs".

Other Thoughts: Originally, the range on the adapter was awful. Even with my whole house WiFi turned off to eliminate interference, the range was pitiful at 6-8 feet. This was too short for HTPC use.

On a friend's whim, I plugged in the adapter to a 6 foot USB extension cable and moved it away from the PC chassis. Now, the range is close to the advertised 30 feet!

In short, for keyboards and mice <3 feet away, there should be no problems. For using this at extended range, the USB extension cable did the trick.

Did you find this review helpful? Yes No

  • Anonymous
  • 10/8/2014 5:22:30 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsDoes the job without issues

Pros: Came with disc (CSR Harmony), works well, minimal dropouts. I'm using it to play music from a Dell tower to a Jambox about six feet away.

Cons: CSR Harmony takes a little time to get acquainted with, but that was not a problem for me.

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  • Aaron R.
  • 9/20/2014 10:33:04 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsGreat, except...

Pros: Works brilliantly with CSR Harmony

Cons: CSR Harmony crashes Windows Explorer

Other Thoughts: Windows 7 has an awful Bluetooth stack implementation, and the only seemingly "good" alternative Bluetooth stack out there seemed to be CSR Harmony, from my research. The trouble is, it requires a CSR-based chipset/dongle.

WIth Harmony installed, this thing worked like a charm. I could use a Bluetooth headset without any cut-outs whatsoever. However, I found whenever I had to log in to a network share, Windows Explorer consistently crashed, due to a bug in CSR's software.

If you're not like me, and you don't use your computer on a network that requires 802.1x authentication (or use SMB shares regularly) then this is absolutely an excellent choice. But be wary of Harmony if you do any of the above mentioned. Without it, Windoze BT stack becomes default and the adapter is rendered mostly useless.

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  • 8/25/2014 7:48:44 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsGood product

Pros: No observed or fatal problems in use.

Cons: Range seems limited, but there are some environmental factors maybe affecting it; wifi over 2.4 GHz is packed with other routers in my building.

Other Thoughts: Documentation is sparse, but I just downloaded the drivers from Azio's site and it seemed to register in Windows (7) after that.

In motion signal would sometimes cut out for a brief moment, resulting in reception lag in my BT headphones. This was only seen when approaching its range limits, like walking around a room/apt with a device aired to my desktop with the unit.

1 out of 1 people found this review helpful. Did you? Yes No

  • Dr D.
  • 8/12/2014 4:40:23 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsDid Not Work

Pros: the drivers were easy to use once i figured out how to use them (which took me a solid 4 hours).

Cons: does not work at all.

Other Thoughts: recently i have bought a dual shock 4 expecting to play some games on my pc. as i didn't wan't to play on a cable, as no cable was long enough i would have to buy a blue-tooth adapter (this one right here).
after installing the drivers, and after figuring out how to work the system, i would connect my ds4 to the adapter via bluetooth.
the problem? won't connect.
it initially detects the controller as expected but it says "pairing started" and stays there for about 3 - 4 minutes. then goes to the "could not pair" screen.
yes it is set to discovery mode
yes the controller is on
and yes i have re-installed the drivers and got the same result.
as a customer to this product, i am very disappointed that i can now no longer game using a controller on a rig that i spent $3000 on.
so for that, one egg.

1 out of 5 people found this review helpful. Did you? Yes No

  • Anthony M.
  • 6/28/2014 6:24:33 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorth it

Pros: Connected easy
Came with disc
Stays connected

Cons: I really dont have a con. It does exactly what I expected.

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  • David T.
  • 6/26/2014 12:33:15 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBTD-V401

Pros: Easy setup

Cons: None

Other Thoughts: Love this little Bluetooth USB :)

Did you find this review helpful? Yes No

  • R P.
  • 6/13/2014 7:22:14 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day

5 out of 5 eggs

Pros: none

Cons: none

Other Thoughts: Eric B., what was the default setting you changed?

1 out of 2 people found this review helpful. Did you? Yes No

  • Eric B.
  • 5/13/2014 9:03:46 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: I would like to retract my last review if possible. I found out that the lag was being caused by a default setting on my computer and not by the bluetooth adapter. Now that is all fixed, the adapter is working better than ever and sounds amazing!.

Cons: None now that I got it worked out.

0 out of 1 people found this review helpful. Did you? Yes No

  • Eric B.
  • 5/10/2014 8:58:26 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsstarted good then down hill

Pros: None

Cons: It started out as a great BT device then after two days it started lagging with sound by about a second. That could be ignored but after 5 days it went to 2 seconds and would extend out to nearly a minute by the end of a 4 minute song. Could not voice chat or anything with the annoyance.

Other Thoughts: Don't waste your money.

Did you find this review helpful? Yes No

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