2 versions of Flight Controller are optional, Please choose the version you request: F4 or F3,
F4 Flight Controller support INVA Firmware.

Flytower F4 with 4in1 20A ESC:
Package Included:
1x F4 Flight Controller Board
1x 20A 4 In 1 ESC
3x Cables
1x bag of Screws

Flytower F3 with 4in1 20A ESC:
Package Included:
1x F3 Flight Controller Board
1x 20A 4 In 1 ESC
3x Cables
1x bag of Screws

Flytower F3 with 4in1 15A ESC:
Package Included:
1x F3 Flight Controller Board
1x 20A 4 In 1 ESC
3x Cables
1x bag of Screws

Mini F4 Flight Controller ( Top Layer)
Item Name: STM32F405 F4 Flight Controller AIO OSD and BEC 
Input Voltage: 2-4S Lipo
- Built-in Original Betaflight OSD
- With 5V@2A BEC Output
- Without Black Box
- Support BLHeliSuit setting
- Also support Cleanflight and INAC to falsh firmware
- Support PPM, SBUS (RX1), IBUS (RX6), ds m2 (RX6) Receiver
Firmware: BetaFlight 3.20 SD
Size: 27x25mm 
Mounting Hole: 20x20mm
Net Weight: 3.3g

Mini F3 Flight Controller ( Top Layer)
Item Name: STM32F303CCT6 F3 Flight Controller AIO OSD and BEC 
Input Voltage: 2-4S Lipo
- Built-in Original Betaflight OSD
- With 5V@2A BEC Output
- Without Black Box
- Support BLHeliSuit setting
- Also support Cleanflight and Betaflight firmware
- Support PPM, SBUS (RX1), IBUS (RX6), ds m2 (RX6) Receiver
Firmware: BetaFlight 3.17
Size: 27x25mm 
Mounting Hole: 20x20mm
Net Weight: 3.3g

4in1 ESC Specification:
Item Name: 15A Blheli_S BB2 4 In 1 ESC 
Con. Current: 15A /20A
Max Current: 20A/30A (5S)
BEC: No
Lipo : 2-4S
Programmer: Yes
Weight: 4.8g
Size: 27x31mm (PCB)
Installing Hole: 20x20mm

Features:
- Blheli_S firmware
- BB2 Chip
- Mini Size 4 in 1 ESC ( 27x31mm) and weight (4.8g)
- With 20x20mm Installing Hole
- D-shot 600 indefault
- support D-shot 150, D-shot 300, Oneshot125 and Multishot