was using the Aqara N100 but spoilt due to battery leaking fluids cause I replaced with cheapo batteries... then I replaced it with Aqara A100 and happy so far with it cause I have a lot of smart devices on the Mi home network plus this model works with Apple Homekit as well.

I bought mine off Shopee ... the seller had option for installation as well for bout RM150 if not mistaken.

After I purchased seller provided me a number to call to schedule contractor to come to my place to fix. Installation took roughly one hour.