HobbyWing Throttle Hub00:30

https://www.hobbypartz.com/07e-106-throttle-hub.html

Specification:
Throttle Hub Distribute throttle signal to up to 4 speed controllers
Specially designed for quadcopter speed controller

Features
Specially designed for quadcopter speed controllers.
Calibrate throttle range of the 4 speed controllers of your quadcopter at once.
Distribute throttle signal to up to 4 speed controllers.

Designed for the multi rotor aircraft
1: for the use of multi rotor aircraft four in one electric adjustable throttle stroke
2: as the throttle signal distributor to use, the throttle signal is allocated to multiple (1-4) electronic speed regulator