An active matrix organic LED display having a matrix of multiple light emitting pixels and electronic drive circuitry for selectively addressing the pixels, each pixel containing an organic LED. The safety device contains a hammer locking end for locking the hammer, a trigger locking end for locking the trigger, and a structural support member extending between the hammer locking end and the trigger locking end. Meanwhile, the composite apparatus recognizes unit information for specifying units constituting itself, and creates composite state information based on the recognized unit information, according to the same rule as the above rule. The assembly also has a first trigger, and a second trigger positioned next to the first trigger so that a user can simultaneously actuate the first and second triggers.