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Thanks! And sorry for the million questions, I'm not sure whether to order a 2.1ah or a 2.3ah battery- there is conflicting advice online x thank you x

Thanks so much for your reply. So should I just replace the battery?, or would it be better to replace the transformer too? I need to order the bits today, as its getting much worse. Many thanks again for your help x

Hi, I wonder if you could help..i have the same alarm, but it's making this hideous humming noise of a night, and as the main box is in my fitted wardrobe, in my bedroom, it's really disturbing my sleep. Do you think it's a transformer / battery thing, or a new unit? Many thanks in advance x