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Mice fart louder than most current external sounders Sticking lots of stuff on the alarm means lost of current drawn in alarm all my P24 need 9Ah batterys

There can be unforeseen planning permission issues and they are unnecessary light pollution. You can fit them without connecting the backlight on the X's, but can purchase the twin siren non-X ones for similar price. Covering a new box with what I guess is some old C-Type cover would remove the deterrent of a shiny new box and reduce sound output. If you are thinking of not buying a lid for this sounder it just will not work, they need a compatible lid.