OTA Programmer is a module which adopted the Bluetooth communication technology for transferring data between an ESC and a smart device (Android phone, tablet, and etc). It makes the wireless communication between ESC and smart devices possible; the user can easily program and upgrade ESC and monitor data transferring via this unit. Features / Why you need this? -HOBBYWING over-the-air firmware update. -Programming through a smartphone, smart devices -Access to HW Support* User Manual, Profile manager, etc -Fail-safe feature ( Disable a throttle control when OTA programming is enabled) *Recommend removing the unit before the official event. The OTA Programmer module works with the following products of HOBBYWING. Some of XERUN series & EZRUN series of car ESCs. Some of PLATINUM series of aircraft ESCs. Some of SEAKING series of boat ESCs. -For details, please refer to ESC manual to ensure if the ESC can work with OTA Programmer. Specification: -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: HOBBYWING OTA-LINK Apple IOS Android GoodPlay