OpenVTx to provide firmware with both the SmartAudio and Tramp protocols. Either protocol can be used on the flight controller and on VTx power up the protocol used is automatically detected by OpenVTx. Currently SA is fully implemented and test against . 09. To date IMRC has not released a protocol standard and implementation is based on information found within Betaflight. Main Features: OpenVTX firmware preload Smartaudio ready Nano size and stable power output OVX300 Specifications: Model: OVX300 Frequency: 5.8G 40CH Transmitting Power: 0//25mw/100mw/300mw Power supply: DC 5V Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Material: PCB colour: Black Package Contents: 1 x Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.