Variable pulse rate laser guns, or VPR guns, vary the timing of when they transmit each individual pulse so that laser jammers can't easily predict when the next pulse will arrive and thus when they should send back their jamming pulses. VPR technology is being used by some laser gun manufacturers in an effort to defeat laser jammers.
There are several manufacturers who now VPR technology in their guns, and DragonEye because they were the first to start taking VPR seriously.
VPR technology was effective against earlier laser jammers, but many newer jammers have figured out how to jam VPR guns and they continue to receive updates as new VPR pulse patterns come out.