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Not sure but the siren batteries were first changed in 2012!

Thanks again. It is definitely a 6200. I am not sure about the hatch on the back? I unscrewed the whole of the back and inside there looks like what are 6 aaa batteries sealed in green plastic and attached to the alarm by red and black wires. I did not try to access these as they are clamped in...

Thank you for your response. It is connected to the mains so not batteries. It is also connected to the phone and will ring me up. Its just that I get funny symbols instead of letters (such as * ! %").

I have a Yale HSA6200 wireless alarm. It seems to work fine but the control panel is showing weird symbols in place of the date etc. I can reset the alarm but then the symbols come back (not always the same ones). How can I get rid of these?