[Host] KERUI D121 Door sensor host pair with accessories | #remote control #door sensor #pir motion

How long does it work? Will it work overnight after I turn it on?

do you have a door alarm, that switches off when door is closed , but is ringing as long as the door is open ? (to help remember to close the door)

it can automatic shut the sound like after a minutes? or when were not home and set it on. it can off the sounds?

What battery does the remote need?

What different between d1,d2and d121..?

ıt was really helpfull.thanks alot....

I buy that but it's not ringing

Que pila lleva la alarma puerta