Ukuhanjiswa kokukhanya kwendebe, Ukhetho lwasimahla lwezibonisi ukudibanisa okanye ukungahlangabezi iintlobo ezahlukeneyo zeemfuno;I-decibel ephezulu ye-ceramic buzzer chip kunye ne-chip ekhethekileyo yomqhubi yamkelwa ukwenza imveliso ezinzileyo kunye nomgangatho omnandi wesandi;Insimbi engenasici okanye isibiyeli seplastiki, esingayi kugqwala ukuya kuthi ga kwiminyaka emi-3.