Introduction - If you have any usage issues, please Google them yourself
Responder, two people Responder, respectively, with the button P1, P2 (P1 corresponding button S3, P2 corresponding button S4) shows a bright light that lit D3 when the button is pressed, the same button to 2:00 bright lights D10 no answer after 32 seconds, automatic alarm when people answer in addition to the display lights, the buzzer will sound.