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B-Link Bluetooth Adapter
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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 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.  PLEASE NOTE: Firmware updates are not yet supported on Android and will be released as an update to the Castle Link App in the near future.

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).


View the Castle Link App screen shots in the MORE FEATURES tab below.
View detailed specifications and additional resources for the B-Link Bluetooth Adapter in the SPECIFICATIONS tab below.

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 23 vote(s))
4 review(s) | Write a review
USD $49.95 /EA
List Price: USD $60.95 /EA
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  • Availability: This item is in stock.


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
Note: Firmware updates are not supported at this time. This functionality will be released soon as an update to the App.

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


FAQ (coming soon)

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.

Average rating:
(Based on 23 vote(s))
Rate this product:
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
3 of 3 people found this review helpful
Was this review helpful to you? (3) (0)
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
Was this review helpful to you? (6) (0)
Mark From United States
Make it for Android users.
March 5, 2019
Its great. But limited to people who only have apple products. Making it versatile would make it perfect so both android and iOS/apple users can use it. Please make one for android or a firmware that makes it for use with android.
19 of 22 people found this review helpful
Was this review helpful to you? (19) (3)
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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