The Infinity 305 is a cable 30x30 flight controller from the fine folks over at NewBeeDrone and the slight bigger brother of their 20x20 model, the FC200. To simplify your builds it plug and play with NBS ESC305 (and most other 4-in1 ESCs) and there is a DJI Air Unit plug on board. 

But you don't have to go DJI as there are all your usual pads on the board for other camera, VTx and receiver options.

Flight Controller Specs:

• MPU6000 Gyro
• STM32F405 CPUE @ 168mhz, can be overclocked
• 3-6S direct battery input
• 5V 2A,
• 9V 2A 18W Design for DJI FPV Air Unit
• 5V Camera Power
• betaflight OSD
• Flat bottom PCB for SUPER CLEAN builds
• 36x39 CB with 30.5x30.5 mounting holes
• 6 UARTS. UART1 (INVERTER FOR SBUS)
• UART2 (FREE)
• UART3 (INVERTED TELEMETRY)
• UART4 (Free)
• UART5 (Smart Audio)
• UART6(Free)
• Built-in 4 IN 1 ESC socket(including ESC telemetry, External current sensor) JST1.0 8Pin
• Plug and plug with NBD Infinity30 ESC. Also compatible with most of the ESC on the market.
• Built-in solder pads for ESC signal output and power
• Printed layout instructions ON the board - no need for instructions!
• DJI FPV Air Unit socket (use UART1 and UART6)
• USB-C connector

Includes:

• 1x Infinity305 flight controller
• 4x Grommets short 4x Grommets Long
• 1x Infinity305 FC to DJI Air module cable 40mm
• 1x Infinity305 FC to DJI Air module cable 100mm
• 1x Infinity305 FC to DJI Air module cable 150mm