This is the KO Propo RX Mode Selector. This RX mode selector is used to change the mode of a HSC compatible receiver to either Normal or HCS. Normal mode is for when using non-HCS compatible servos; HCS mode is for use when using HCS compatible servos.
Connecting this product to each channel of the HCS receiver can change the configuration of the mode setting and can confirm the mode being used.
What is HCS?
The HCS mode shortens the communications time of the signal which has been compressed. HCS is a communication method to largely improve linearity of the servo movement. When using HCS mode, corresponding servos (ex., RSx3/BSx3 series) are required.