Smrtdst s systm f mny tny mcrlctrmchncl systms (MMS) sch s snsrs, rbts, r thr dvcs, tht cn dtct, fr xmpl, lght, tmprtr, vbrtn, mgntsm, r chmcls. Thy r slly prtd n cmptr ntwrk wrlssly nd r dstrbtd vr sm r t prfrm tsks, slly snsng thrgh rd-frqncy dntfctn. Wtht n ntnn f mch grtr sz th rng f tny smrt dst cmmnctn dvcs s msrd n fw mllmtrs nd thy my b vlnrbl t lctrmgntc dsblmnt nd dstrctn by mcrwv xpsr.