Wastes a lot of batteries and time.

Use rechargeables! Must replace batteries every 3 months and always at 3 am. I have seven interconnected. Very annoying. Hard to tell which needs batteries replaced. All seven demand new batteries while the batteries are still running strong. I switched to rechargable Eneloop Pro but there is no change in replacement frequency. Speech is difficult to understand and not repeated so I still don't know where the fire is. Better to spend more on Nest or less on a non line powered version with 10 year sealed battery. 2 star because the smoke sensor works and the interconnect works. I regret buying this model. And the irritation of getting a ladder out at 3 am to replace 280 pairs of batteries over the next 10 years. RIDICULOUS! UGH! I hope they quit working early.

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