Telephone cable with an RJ11 connector at each end. The cable can be used to connect a telephone to a wall socket with an RJ11 connector, for example.
Sandberg Telephone RJ11-RJ11 10m
Sandberg Telephone RJ11-RJ11 10m. Cable length: 393.7" (10 m). Package width: 2.76" (70 mm), Package depth: 2.36" (60 mm), Package height: 6.57" (167 mm). Connector(s): RJ11-RJ11