C482 Snooping Device Storm

"I've got a plan, and it's this!" Yeh Sen exclaimed, pulling out a device from under the table. It was a square box with two antennas, a few buttons, and a rotary switch.

"What is that?" Ye Zhenzhen asked, puzzled.

"This is how we found the bugs. I got it from Shunyu!" Yeh Sen said, his chin held high, as if waiting for Ye Zhenzhen to praise him.

"Even with this device