Hobbywing OTA Programmer : HW30850400 The Hobbywing OTA Programmer utilizes Bluetooth communication technology to facilitate data transfer between your ESC and a smart device (such as an Android or IOS phone or tablet). This wireless module allows for easy programming and upgrading of your ESC, as well as monitoring of data transfer. The Hobbywing OTA Programmer module works with the following products: Most XERUN and EZRUN series of car ESC's Most PLATINUM series of aircraft ESC's Most SEAKING series of boat ESC's. Please refer to your ESC manual to ensure your ESC will work with the OTA Programmer. Hobbywing OTA Programmer Features: Hobbywing over-the-air firmware update. Programming through a smartphone and smart devices. Access to HW Support, User Manual, Profile manager, etc. Fail-safe (Throttle control is disabled when OTA programming is enabled) Spec Check: Working Voltage: 5V-12.6V. Supported Bluetooth Version : ≥ 4.0 • Effective Range: 0-3m (Open Field). Size: 30.0x25.5x8.5mm (LxWxH). Weight: 10.2g. Apps: HW Link V2 (Apple IOS/Android)