He first demonstrates the difference between an authorized key and an unauthorized one.  When one isn’t programmed with access you will see a red light and hear a beep.  When one of the keys is programmed for access you will see a green indication and hear the click of the relay which will open the door.  re is a list of items he uses to make this garage door opener.  He uses:

• One energizer batters
• Transistor
• Two RFID keys
• Manual activation switch
• A four switch dipswitch
• A relay
• One hard coded master key

To program additional keys from the master key he scans the new key and adds to the memory.  You will notice both work after syncing with the master key.  We hope you enjoy the video.