The flight controller board is part for Flycolor X-Tower Omnibus F4 Flight Stack.

Main Features: 
F4 flight controller with 32 Bit 4in1 ESC
40A ESC supports 3-6S
Highly integrated, easy and convenient to install 
Dual Vibration damping, super durable

Specifications:
Model Name: Flycolor X-Tower F4-40A
Con. Current: 40A
Burst Current (10 second): 45A
Lipo Cells: 3-6S
FC Volt: 3.3V/5V/12V
FC Firmware: OMNIBUSF4SD