How do you program sr3 remote to remote?

To program an SR3 remote to another SR3 remote, first ensure both remotes are powered on and within range. On the master remote, press and hold the "Program" button until the LED indicator blinks, then release the button. Next, on the slave remote, press the button you want to program while the master remote's LED is still blinking. Once the programming is successful, the LED will turn off, confirming the connection.