‎AA battery

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ZINC ALLOY
5-in-1 Smart Door Lock: Fingerprint + APP control +Passcode + Key Fob+ Key. Support Remotely Unlock5-in-1 Smart Door Lock: Fingerprint + APP control +Passcode + Key Fob+ Key. Support Remotely Unlock work with Alexa and smart watch/google home (need a gateway, sold separately). Great smart home devices for front door hotel, apartmenty). Great smart home devices for front door, hotel, apartment