When the handle on the side is cranked, a slightly off-key peice of music, vaguely reminiscent of something the hearer listened to as a child is played.
When you crank the handle, everything within earshot of the box is paralysed with fear until the cranking stops. Once it does, the lingering fear effect may cause them to flee or become frenzied with rage, depending on natural inclination. In addition, roll +WIS. On a 10+, you are immune to the effect this time. Otherwise, you are horribly shaken by the sound, but can continue cranking, although doing so for long will be defying danger. On a miss, the box gets one step closer to opening. How many times can you use it before you release whatever horror is trapped inside?