Just like Yankees jerseys, this is the sort of thing you should keep out of Boston. It's called the SLD, or Suspicious Looking Device, and it's manufactured by Junkfunnel Labs. It has all kinds of fun features, like a character display, buzzer, plenty of LEDs, and touch and distance sensors. Table of Malcontents explains that it's actually Ghostbusters-inspired. (Side note: Why has no one made a video mashup of Ghostbusters and the Great Mooninite Bomb Scare of 2007?)
According to the Junkfunnel Labs product page, "the only function of the Suspicious Looking device is to appear as suspicious as possible, whether carried in hand or placed indiscrimately in public places."
Sounds good to me.