Instead of using electricity, these systems use radio transmitters that send signals to control units.
Ematshan'weni yo tirhisa mahlo, swimovhana sweswo swi tirhisa thekinoloji yo vulavurisana; ematshan'weni yo tirhisa lateral line, swi tirhisa laser leyi swi byelaka loko ku ri ni swimovhana swin'wana leswi nga ekusuhi na swona.