录音键 meaning in English

record button

I . when alarm happens , it will automatically dial out the two pre - entered phone numbers to inform the users . ii
2当有人来访而住户不在家时，访客可由门口机处按下录音键即可对住户留言。
At the same time , it sends the alarm signal to the control center . iii . remote monitoring the noise at your home by using the telephone
1当住户有事外出欲留话给家人时，只须按下录音键即可自录留言。