Smoke alarm problem


My daughter has two smoke alarms fitted in her house, one up and one downstairs. They are mains operated and by some strange co-incidence, both have decided to take it in turns to 'beep' similar to battery operated units which need the batteries changed. This has been going on for two weeks or so. Both units display the green power light. Anyone any ideas please?
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Are they mains operated with battery backup? If so then change the batteries. If not then give a make and model number.
Cheers
Adam
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Change the back up batteries. The warning is because the batteries are low, they last maybe 18 months if you are lucky.
Mr Pounder

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Have you even read the manual on them? Looked them up at the mfr site? Checked to see if there were any notes inside the unit? Checked to see if they DO have batteries? Or anything that would help yourself?

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