CASTLE is a top producer of high performance, high quality products for RC aftermarket upgrades with a 25-year track record of innovation and record-breaking performance. The 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! | 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. | SYNC information between multiple devices by creating a free account (requires internet connection to sync database).