If the LED on the remote is dim or doesn't light up, the 12V battery likely needs replacement.
Typically powered by a 12V battery (such as the 27A or 23A alkaline batteries) or integrated directly into a 12V-24V DC circuit for relay modules. rct332
Many older or specialized security arrays use the RCT332 protocol to arm or disarm alarm systems. Its simple interface (usually 1 to 4 buttons) provides a foolproof way to manage system states. Programming and Troubleshooting If the LED on the remote is dim