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B-Link Bluetooth Adapter

Product #: 011-0135-00

Control at your fingertips!

Castle Link™ ESC tuning is an essential component for customizing vehicle performance for many Castle Creations’ customers. While the controllers are plug and play, optimizing a Castle ESC through the Castle Link Programming Suite unlocks the full range of capabilities that set Castle apart from the competition. Users enjoy the ability to adjust many variables to enhance their experience including throttle, braking curve, drag brake, reverse type and more. The Castle B•LINK™ Bluetooth™ Adapter enables users to wirelessly program settings and view and download data logs on current Castle Creations ESCs, many older models and the BEC 2.0/BEC Pro on Apple iOS devices and now Android devices!


  • Apple devices require iOS version 10.0 or higher. Click HERE for a list of compatible devices.
  • Android devices require version 5.0 or higher.

A complete listing of compatible ESCs and accessories can be found here.

The free Castle Link app for iOS is available on the Apple App Store for use with iPhones and iPads, and Google Play for Android devices. Once downloaded, it does not require a data connection and can be used anywhere, including remote areas.

  • WIRELESS BLUETOOTH COMMUNICATION allows you to interface with most Castle Link compatible ESCs and accessories to change parameters and update  firmware.
  • COMPACT AND LIGHTWEIGHT at 1.20" x .81" x .25" (30.48mm x 20.55mm x 6.55mm) and 0.23oz (6.62g), it can be installed in the vehicle or airframe without significantly increasing model weight.
  • CONVENIENT WATERPROOF DESIGN allows you to quickly adjust settings in the field without disconnecting or disassembling the model. It can stay installed in the model or be easily swapped between models.
  • FREE APP DOWNLOAD is readily available in the Apple App Store and Google Play. Once downloaded it does not require a data connection so it can be used in the most remote of areas and won’t use data.
  • EASY TO USE application can be used with multiple B-Link Bluetooth Adapters or can store model information and allow you to use one adapter on multiple models.
  • PASSCODE PROTECTED with (user-selectable) 4-digit code to prevent unwanted tampering with your settings.
  • SYNC information between multiple devices by creating a free account (requires internet connection to sync database).

Note: Castle B-Link Bluetooth adapter is not compatible with Castle Telemetry Link for Spektrum X-Bus and Castle Telemetry Link for Futaba S.Bus2. The B-Link can be used to adjust settings on the ESC; but it cannot be run in conjunction with the Telemetry Links.
(Based on 29 vote(s))
10 review(s) | Write a review
  • USD $54.95 /EA
  • List Price: USD $67.95 /EA
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Code Availability Quantity
011-0135-00 This item is in stock. EA

Technical Specifications 

Input Voltage:

Minimum: 4.5V - Maximum: 13V

Max Continuous Current: 


Maximum Burst Current:


Dimensions (with wires):

7.25" x 0.81" x 0.27" (184.15mm x 20.55mm x 0.27"mm)

Dimensions (w/o wires):

1.20" x 0.81" x 0.27" (30.48mm x 20.55mm x 0.27"mm)


6.62gm / 0.015lbs

Needed for Operation:

Castle Link App found at Apple App Store or Google Play and compatible ESC and/or Accessory

Tech Notes:

Not compatible with Castle Telemetry Link for Spektrum XBus and Futaba S.Bus2



Castle Creations, Inc. warrants this product to be free from manufacturing defects for a period of one year from date of purchase.  Click here for additional information about our warranty.


The Castle Link App contains all of the same tuning options as the Castle Link USB Programming Suite used on a Windows compatible PC, now with even greater flexibility. 

Note: It is not possible to view data logs through the app at this time, but developers will continue to add features such as this.

iPhone 8 Screen Shots

Android Screen Shots

Average rating:
(Based on 29 vote(s))
Rate this product:
Mike From Canada
Super Convenient
January 2, 2023
I have 3 of these B-Links, permanently mounted in my Ryfts and VS4-10. I find them super convenient to make programming changes on the fly to account for changes in terrain and general conditions. Too much drag brake, call it up and change the setting and send to the esc. Still don't like it, change it again. All kinds of settings can be changed as you go. Well worth the extra cost.
1 of 1 people found this review helpful
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Mike From Ny
B-link and telemetry
March 22, 2021
Make b-link compatible with the telemetry connector ftw
3 of 4 people found this review helpful
Was this review helpful to you? (3) (1)
Billy From United States
Need to Fix Current Limiting Save Bug
July 4, 2020
Good product but currently collecting dust -- literally. If you modify the "current limiting" setting, then save settings, the current liming value will default to 200A. In fact, if I set the current limiting value to more than 200A on PC -- then use B-Link to adjust and save settings other values (yet do not change current limiting), current limiting defaults to 200A.
I have had this since fall and no update as indicated by support. I understand that Covid-19 has affected R&D schedules (as a PM, I am in the same boat) -- but status would be nice.
Will definitely change score when resolved. :-)
14 of 16 people found this review helpful
Was this review helpful to you? (14) (2)
André From Germany
July 25, 2019
Nice tool, works perfectely. Easy 2 use.
BUT still no Data-Logging possible (u cant read them out)
7 of 9 people found this review helpful
Was this review helpful to you? (7) (2)
Gadget Guy From United States
Stop Your Whining Android Users
July 6, 2019
Stop bashing a product you can't even fairly evaluate. CC already said an Android version is on the way, so stop your whining already. I'm an Apple-only guy and didn't whine when they didn't support Mac OS X systems. I just created a Windblows partition on my laptop and boot into Windblows anytime I need to mod an ESC. This is a great solution for Apple users and so much simpler to use in the field than lugging around a laptop. Kudos to Castle Creations for engineering a great product like this. Enjoy the Android support when it gets here. Be patient grasshopper.
13 of 44 people found this review helpful
Was this review helpful to you? (13) (31)
Petko From Denmark
Needs an android app
July 3, 2019
Please make an android app.
There people outside of the United States aren't very fond of apple and their overpriced products.
If you look at the global Mobile OS usage, you're on the wrong side.
Android 72.48%
iOS 26.64%
12 of 22 people found this review helpful
Was this review helpful to you? (12) (10)
Jarret From United States
Mobile OS Market Share
June 5, 2019
So the Bluetooth adapter and software were developed for iOS only, which has a global market share of just 14.9%, vs Android with 85.1% (via This gap is projected to widen between now and 2022 by 2 to 4%.

Hopefully an Android version is in the works. 85% is a lot of lost consumers.
4 of 14 people found this review helpful
Was this review helpful to you? (4) (10)
Dale N From Pennsylvania
April 21, 2019
Love the wireless connectivity but without it working on Android is a huge minus. And the other downfall is you cannot connect wirelessly to your data log. I have had this awhile and seems like nothing gets done to fix it. Not very happy due to those reasons
4 of 4 people found this review helpful
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Computer Nut From Canada
March 17, 2019
Having previously used a Castle Link with an Axial ESC and 10A BEC, when I purchased my new Mamba X I decided to get this new B-Module. I am glad I did, works great and no having to disconnect everything to re-program it. I only wish the promised Android version would come out soon so I wouldn't have to use my work iPhone.
6 of 6 people found this review helpful
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Vern Hicks From Canada
B link
May 15, 2018
Works effortlessly and his I feel essential to castle ESC’s. Definitely enhances experience. Links while vehicle running and disconnects without power off so cool.
13 of 18 people found this review helpful
Was this review helpful to you? (13) (5)

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