A locating device for locating a body such as an electrical box behind a wall or ceiling. The DSL modem includes a connector comprising a first pair of conductors and a second pair of conductors. , processing of an operating unit and processing of a random logic circuit, which limits its size and processing performance. The rigid mattress portion contracts from a first elongated position to a second retracted position, and the rigid portion contracting the compressible mattress portion therewith.