BLHeli_S ESC with Hardware generated PWM synchronous to MCU yields ultra-quiet motor performance.

Utilizes high-performance EFM8BB21 50MHz MCU
BLHeli_S does Damped Light only
Firmware upgradable via signal wire (works with USB Linker for XM series)
Supports Motors with super high KV (EFM8BusyBee 50MHz can handle up to 500k eRPM)
Supports DShot600, DShot300.
High-current burst rating
High-Resolution Throttle steps
  
Specifications: 
  
DYS XS Series XSD20A 3-4S Speed Control (BLHeli_S Firmware, support Dshot600, Dshot300)
Item Name: XSD20A solder version
Input voltage: 3-4s Lipo
BEC: NO
Size(mm)L*W*H: 24*14*4.5mm
Type: BLheli_S & Dshot600/Dshot300
Weight: 4.32g
Feature: Silabs EFM8BB21