The object on the roof that I didn’t recognize was the same 12 channel remote control switch just flipped over in a separate photo.
Note the range: 1000 meters = 3280 feet.
Distance from the dead shooter on the AGR roof to Lawrence Avenue (white van) or the Sheetz gas station (where Crooks’ car may have been parked) is no more than 1500 feet (see map here:
Where Were The Two Local Snipers When Trump Was Shot? - #828 by macd).
Suspicious devices
Investigators said Tuesday they found a remote transmitter in the suspect’s pocket that may have been intended to set off two suspicious devices found in the suspect’s car and one in his home, according to law enforcement sources. Devices at both locations were similarly constructed in ammunition containers using components including receivers that appear to have been paired with the remote control found in the suspect’s pocket, sources said.
The receivers in each device were connected to a series of components that investigators say met the “eye test” – having parts present that could have made viable explosives, although the functionality of the devices is still being determined. The purpose of the devices is also unknown. Whether they were intended to cause a significant blast to hurt people or if they were designed to create smoke, fire and a low-grade blast for a diversion is unclear.
Secret Service spotted Trump rally shooter on roof 20 minutes before gunfire erupted - ABC News