Old System

How to install the jumper cable on this?

Hi @user45372. You will need to find out the make and model of your chime, look into its product manual online if possible, and determine which two terminals are the front and trans terminals. Once you have that figured out, you can use this Help Center article for guidance on installing your Jumper Cable. If you need further assistance or are not comfortable doing your installation, we strongly recommend consulting a qualified electrician.