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Review title: Poor design, loud false alarms that you cannot turn off
Product review: I bought several of these to add to and replace some hardwired Firex units in my home. Today, they false alarmed for the first time - nearly 6 months after installation. It was impossible to determine which unit was the trigger for the alarm. The hush button didn't work either. In fact, the button is poorly designed and can get stuck. I replaced the batteries in all of my detectors with fresh ones and still had problems. I am so frustrated with this product.
