Hero replica of the remote detonator the Joker resorts to using, after the passengers of two ferries stranded in mid-crossing refuse to destroy each other in order to save themselves.
A small black slider switch arms the device, activating the green LED. (Luckily, the Joker fumbled this step, giving Batman an opening.) Turning each key lights a red LED, and in the movie, detonates the explosives aboard one of the boats. Built from Velleman electronics kits and components.
By benhs1898 and fotokid.
