I’ve seen a lot of interest in the Aqara U400 but honestly I love my U50. I got it on Black Friday and have been using it for the last six weeks and it’s been great. I especially like the HomeKit integration and the ability to use Apple Home Key. I can just tap my watch or phone on the lock and it unlocks.
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Thank you for sharing ，the best product is always the one that suits you best 
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