Hello,
my aqara hub M3 is installed in my main room and Vibration Sensor T1 is installed in mailbox outside home. between the hub and the sensor i have Aqara Smart Socket H2 EU connected and used as repeater
my Vibration Sensor T1 disconnect sometimes
do you have any other recommandation for zigbee extender ?
Welcome to the forum.
Maybe a T2 bulb in a light fixture by the front door or an outside light of you have one?
Hello and welcome to the forum.i think the socket is not making the bridge between the vibration sensor and hub.to use the socket as bridge you need to pair the sensor directly from the mailbox this way the sensor will see the socket and will use it as bridge but I bet that before you mount it you pair it near to the M3 hub this way many bateries powered sensors like the vibration doesn’t change the zigbee route and keeps the same route to the M3 hub directly.so eliminate de sensor from aqara app and then go near your mailbox and pair it from there.
Thank you so much for your reply.
i will try to add a Ceiling Light LED (like T1M but small) in the door entry to have a better zigbee extention
exactly yes. you are right, i think now it’s time to disconnect and reconnect the mailbox vibration sentor T1 to force it use the Aqara Smart Socket H2 EU
i am also thinking to install a new Ceiling Light LED (like T1M but small) in the door entry if i found a small one because i can not use bulb 
best regards
Sure more zigbee bridges better connection.but you also could use an Aqara smart plug if you can’t find the right bulb but even so if you socket is near try to connect the vibration tru it and see the signal strength after that my be you won’t need another zigbee bridge