Remote Chime Model ED-5050-A Pack contents: ° Plug-In Chime (PC) eo Chime Extender (CE) eo 2 screws, 2 wall plugs and 2 double-sided tapes for mounting the chime extender. Note: You will need to purchase 3 x AAA alkaline batteries for the chime extender, You will require: e A small Phillips head screwdriver. Installation Instructions Please note: Installing the chime extender on or near metal structures or reinforced PVC structures may reduce the transmission range.