SPEDIX IS 30A 4-1 Speed Controller 2S-4S
This 4-1 ESC features:
6 standard sized MOS-FETs in a larger size of 5 x 6mm
Superfast EFM8BB21 MCU
Independent half bridge drive chip, and 3 Oz copper PCB with high TG
Distances between mounting holes are 30.5mm.
The dimensions of the board (except the soldering pads) are 36 x 36mm ( same as the standard flight controller )