Is this ESC 10A or 20A?
The version 1 of this ESC only support 10A. However, V2 has been upgraded to support 20A in 3S (4S maybe overheat). So basically it supports 10A in 4S and 20A in 3S Li-Po Battery.

RacerCube

• Weight: Approx 8.5g

Omnibus F3

• With MPU6000 (6DOF Version) & SPI Connection
  
• IC STM32F405RGT6
• With 128Mb Flash(16M Byte) Blackbox
• Onboard 5V/1A BEC (Output)
  
• Onboard OSD
• Weight: 8g
• Size: 27x27mm
• Mounting: 20x20mm (M2.5)
• Factory said they use M2 Nylon Spacer & Screw
• Default Firmware: betaflight_3.1.0_OMNIBUSF4
• could be changed from time to time
• Onboard LC Filter
• Input Voltage: 2-4S Li-Po
• Support DSHOT
• Support SBUS/PPM/DSMX
• Set RX1 as connection port when SBUS/DSM is used
• DMS uses 3.3V
• SBUS/PPM uses 5V
• Support Buzzer / LED
• Support BLHELI ESC Programming
• Support Cleanflight & BetaFlight

BLHELI_S 10-20A (V2) ESC

• Firmware: BLHELI_S
• Voltage Input: 2-4S LiPo/2-4S HV LiPo
• BEC: None
• Current:
  
• 10A With 2-4S Battery (15A Peak @ 5 seconds)
• 20A With 2-3S Battery (more safe).
• Size: 27x27mm
• 31*3.15mm Included Soldering Pads
• Mounting: 20x20mm (M2.5 Hole)
• Weight: 3.6g
• DSHOT, OneShot Supported
• MOS: TPN2R703NL
• MCU: SILABS  EFM8BB21F16G

Receiver Connection Note

• Use RX1 as port when using SBUS & DSM
• DMS uses 3.3V Port
• SBUS & PPM use 5V Port

Data Cable Note

• The data cable between FC and ESC must be 5 wires. The missing wire is not use and must not be used because if your cable is 6 wires. The Red Wire will supply battery voltage to the F4 and will burn the F4 immediately. So you must make sure the data cable is only 5 wires before use.
• The F4 FC is used together with 10A V2 ESC (the new version ESC)

Package Included

• 1 x F4 Omnibus Fight Controller
• 1 x 10-20A V2 4-in-1 ESC

Note: M2 Nylon Spacers are used on these boards. So you may need to get some M2 size spacers and screws.

** Warning: The default firmware shipped with the board has been tested and configured by the factory in working condition (factory flashed the board with tested firmware manually via USB). You will be responsible for damage (or any part of function not working) if you flash your own firmware. So you are recommended to use the default firmware which shipped with the board. Thank you for your understanding.

** Warning: You must be very be careful when you do soldering on this ESC because it is small. All IC components on this board are tiny so the soldering iron/gun might damage the ICs if it is overheat. So you must have good soldering skill (fast & clean) to do this job properly.