While MP3s are smaller, they use "lossy" compression that can remove subtle data. For e-stim, where the "sound" is actually an electrical instruction, the precision of a WAV file ensures the device responds exactly as the creator intended. How They Work
Why Is E-Stim so Different To Other Types Of Sex Toy? - ElectraStim Estim Wav Files
Many modern stimulators, such as the ElectraStim Flux or AXIS , use stereo files to control multiple outputs independently. The left audio channel typically controls one electrode output, while the right channel controls another, allowing for complex, moving sensations. While MP3s are smaller, they use "lossy" compression