This particular smoke detectors gsm listening device is based on the Vario series, it uses the same module and is carefully mounted onto a smoke detector. The vario series offers two options:
The smoke detector GSM is easy to place and mounts onto a normal ceiling. You can either use super glue or a couple of screws to mount the product. The smoke detector comes with 2x batteries 5400mAh.
One battery gives about 90 days of standby, the product is usually shipped with 2 batteries for the customers convenience and to ensure suirveillance can be maintained in the event of the first battery losing power.