No battery but power from house where I have also wi-fi modem. I plan an arduino board as an interface between the facial recognition camera and the smart box with Bluetooth. I upload a guest photo and when the guest shows up in front of the camera the Arduino board recognizes the guest and sends a signal to the smart box that opens allowing the guest to collect the keys to the apartment. In the same way the guest shows up in front of the camera that opens the box where the guest can put the keys back and leave.
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