Each RailBoss 4 Transmitter now has built-in vibration motor that can be used for tactile feedback. Sometimes at a distance, you may wonder did that command take or not? Our radio system actually consists of transceivers in both the transmitter (remote) and the receiver (loco). So now, when you press a button, the loco will signal back to the transmitter to pulse the vibration motor, telling you the command was received and executed.
This feature is optional, and can be turned on/off with User Programming Parameter 13 on the receiver. It can also be useful for checking your radio range.