Disclosed is a self-contained battery powered remotely controlled strapping and interconnection device for providing various selected interconnections and terminations of telephone lines or line pairs to which it is attached in order to establish testing configurations comprising a plurality of multi-contact latching relays selectably operable through a plurality of shift register devices under the control of an on-board processor responsive to dual tone multi-frequency instructional command signals remotely applied to a pair of lines. Plug-in expansion modules and battery charger modules are provided.