This part is the replacement compressor start relay for your refrigerator. It is made of black plastic and is approximately 1 ¼ inches long and 1 inch wide. The compressor start relay attaches to the compressor and helps to start the compressor motor. If the compressor will not start, or if your refrigerator or freezer is too warm, you may need to replace the compressor start relay. This part is sold individually. It is an OEM part sourced directly from the manufacturer.