Your suspicion is incorrect. "Pen/trap device" refers to a "pen register" or "trap and trace device" as defined by 18 USC §3127(3-4): (3) the term “pen registe

Your suspicion is incorrect. "Pen/trap device" refers to a "pen register" or "trap and trace device" as defined by 18 USC §3127(3-4): (3) the term “pen register” means a device or process which records or decodes dialing, routing, addressing, or signaling information transmitted by an instrument or facility from which a wire or electronic communication is transmitted, provided, however, that such information shall not include the contents of any communication, [...] (4) the term “trap and trace device” means a device or process which captures the incoming electronic or other impulses which identify the originating number or other dialing, routing, addressing, and signaling information reasonably likely to identify the source of a wire or electronic communication, provided, however, that such information shall not include the contents of any communication;