Pulse is one of the few films I'd say is better watched on a laptop or phone than the big screen. In Pulse, sound plays a critical role in portraying the ubiquitous nature of digital technology in a sinister light, especially the sounds of the technology itself. For example, a majority of the indoor scenes of the film are overlaid with a constant “buzz” that seemingly emanates from the many computers and other devices characters interact with. This maddening sound highlights the film's exploration of technological anxiety in a particularly effective way. The screen is a black mirror indeed.