Indispensablemais unreliable

For the security of a home, fast and easy installation, powerful alarm, bought with a long life battery operated separately since as indicated further notice normal battery supplied with my camera was three months of the usage limit. So do not control the long-term model that is more expensive.

I change my assessment because after three months the unit has failed (false alarm and continues) So I contacted the Kidde service twice to obtain a return authorization, but I have had no response from them, I find this approach unacceptable for me I will buy more material of this brand (unsafe equipment and no service)
By cons thank you Amazon for solving my problem.