Resonance Blaster

The Resonance Blaster is a sonic weapon of Decepticon design.

Prime cartoon
The Resonance Blaster was created by Decepticon scientists. At some point, the Autobots got their hands on it, and it ended up being stored in the Iacon Vaults. When the Decepticons attacked Iacon, it was launched into space and eventually ended up on Earth. Its landing coordinates were recorded in the Iacon database and years later decrypted by the Nemesis during a moment of consciousness. The Decepticons dispatched Soundwave to find it, and the Autobots sent Ratchet and Wheeljack. Soundwave, distracting the Autobots with Laserbeak, managed to find the relic first, and used it on Wheeljack during the subsequent fight. It dealt with the Autobot well enough that Soundwave was able to collect Laserbeak and take the weapon back to the Nemesis, where Megatron was pleased with his work.

Knock Out borrowed the weapon so he could go an fetch an Omega Key. It proved its worth as he took out both Arcee and Bumblebee easily with it before making off with the key. He returned it to Soundwave, who then used it to capture Smokescreen. The Resonance Blaster was appearently with Soundwave when he was trapped in the shadowzone by Jack, Miko, and Raf, as it was never seen again.

2015 Robots in Disguise cartoon
Years later, Soundwave managed to briefly escape the Shadowzone and at one point used the Resonance Blaster (or a weapon identical to it) on the Autobots... but merely as a regular blaster. Perhaps he didn't see Team Bee as a real threat?