The batteries are certified for last 1 year.
I bought two sensors to interconnect.
For one the batteries are dead after 2 months for the other they died after 3 months.
In each device it takes:
- 3 x 1.5V AA batteries used to power the antenna, which manages communication (detection information sent).
- 1 9V battery used to power the module for standalone operation (smoke detection, alert sound).
A year that is costing you an arm ...
Prefer devices with lithium batteries!
