Geoffrey McGann, 49, was caught with the device and even stranger items in his luggage Thursday evening, TSA agents said.
The "elaborate watch" was buried beneath McGann's coat in a luggage inspection area, and it had been attached to wires, a toggle switch, fuses and a circuit board, TSA agents said.
In addition, McGann's boots were two sizes too big and were stuffed with layers of homemade insoles, which allowed for large cavities where someone would be able to hide items, Alameda County sheriff's Sgt. J.D. Nelson told the San Jose Mercury-News.
McGann was also wearing a military-style shirt with a built-in tourniquet in the sleeves, often used by soldiers to stop bleeding if they suffer an arm injury, the sergeant said.
He was arrested for felony possession of materials to make an explosive device and possibly remains at Santa Rita Jail in Dublin on $150,000 bail. But he disappeared from the online inmate locator internet page today,
According to a dispatcher at the Alameda County Sheriff's Department, the agency's online inmate locator is down and the watch commander, Sgt. Howard Barron, could not be reached for comment.
McGann allegedly took off his watch while going through a checkpoint at Terminal 2 about 7:45 p.
The bomb squad arrived within ten minutes after the 7:45 p.m. Thursday call and after examining McGann's watch, but found no explosive threats, Nelson told the San Jose Mercury News.
McGann was trying to board a Southwest Airlines flight back to his home
in Rancho Palos Verdes, according to ABC News.