I don't know about other French alarms, but mine also has a battery backup.
My old alarm has a backup - it's 18 months old, 4 legged and is starting to get territorial. He's called Theo.
Old alarm tends to sleep a lot now - he's getting on for 16 and, even as a fairly vigourous terrier-cross (or cross terrier) it's all getting a bit much.
The cats are content to leave such things to the menial species like humans and dogs.
Biting the hand that feeds IT
