This is KO PROPO 4S Servo Model Selector.. BSx4 servos can be changed model memory which saved in the servo which is 5 pattern. So you can change and use model memory which set for each track or car. Servo wire of this unit connect to receiver which is use for power supply. And please connect servos to the terminal in this unit. You can know model memory number by LED's light on pattern. This pattern willl be changed by press switch in the this unit. Please press button until pattern will be cahnge to same number as like you needs. Displayed number when connected is selected model memory in now.
KO PROPO 4S Servo Model Selector (1 pc)