North Korea has started broadcasting its own loudspeaker propaganda across the border in response to Seoul’s resumption of its own similar campaign following Pyongyang’s hydrogen bomb test, officials said Monday. 

“The North Korean military is broadcasting (a loudspeaker campaign toward the South) at multiple locations,” South Korea’s Defense Ministry spokesman Kim Min-seok told reporters. The broadcasts reportedly include messages promoting its leader Kim Jong-un and criticism of President Park Geun-hye.

Though the reclusive regime’s loudspeakers are too outdated to blare the message into the South, some cross-borders residents, such as those living on Gwanghwado Island, reportedly heard messages such as, “The power of the people and the military with a hydrogen bomb is unmatched.”

Given that the North’s loudspeakers are not clearly audible — they were said to make buzzing sounds — sources said that the loudspeaker campaign would also serve as a distraction for its own residents from anti-regime propaganda, such as the smearing of Kim Jong-un.

Compared to the South’s devices, whose sound output can reach as far as 20 kilometers beyond the border, the North’s sound output is said to be half that. The North’s loudspeakers were also said to be vulnerable to power outages.