ABC News said it has obtained photos of the inexpensive radios, which were outfitted with explosives and contained magnets that would have made it possible to attach the devices to a vehicle.
The devices were found in a Bangkok home after explosions Tuesday that were were similar to those used in recent attacks on Israeli targets in India and Georgia. More than a pound of white military explosive was found in one unexploded bomb, Thai officials said.
Five people were injured in the Bangkok explosions, including suspect Saeid Moradi, an Iranian national who lost both his legs when a bomb he had allegedly thrown bounced back and exploded near him.
A surveillance photo of a man identified as Moradi shows him holding a radio in each hand, ABC News said Wednesday. Two other people have been arrested in the explosions and a fourth person was sought.
Authorities say a magnetic bomb was discovered attached to the car of an Israeli diplomat in Tbilisi, Georgia, and a similar device was believed responsible for an attack in New Delhi that injured the wife of an Israeli diplomat and three other people.
Iran has denied any connection to the incidents.