Check the listing for details. Castle Creations B-LINK Bluetooth ESC Programming Adapter 011-0135-00. Condition: New. Listed at 49.95 USD. CSE011-0135-00 Castle B-Link Bluetooth B-Link Bluetooth Interface Adapter, for Apple iOS ESC tuning is an essential component for customizing vehicle performance. 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. The free Castle Link app for iOS is available on the Apple App Store for use with iPhones and iPads, and once downloaded, it does not require a data connection and can be used anywhere, including remote areas. Features: Compact and LightweightConvenient Waterproof DesignFor Apple iOSFree Castle Link App Download Specifications: Dimensions: 1.20" x .81" x .25" (30.48mm x 20.55mm x 6.55mm)Weight: 0.23oz (6.62g)