OTA Programmer Bluetooth Module 20 ◆ CNC Aluminum Alloy for

◆ CNC Aluminum Alloy for High Efficiency Cooling and Well-Protection

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The wheel diameter is 20mm

OTA Programmer Bluetooth Module 20 ◆ CNC Aluminum Alloy forOver The Air Programming Device fits in your pocket 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 device 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.