Ukusatshalaliswa kokukhanya kwendebe, Ukukhetha kwamahhala kwezibonisi ukufanisa noma ukungahlangabezani nezidingo ezihlukile;I-decibel Ceramic buzzer chip ephezulu kanye ne-chip yomshayeli ekhethekile yamukelwa ukwenza ukuphuma okuzinzile kanye nekhwalithi yomsindo ejabulisayo;Insimbi engagqwali noma ubakaki wepulasitiki, ongeke ugxume iminyaka emi-3.