Smart Lock U400 Kit (includes M100 hub)

1) Open the battery cover and remove the battery.
2) Rotate the knob and check if the locking and unlocking runs smooth, if you feel any jamming, unscrew and remove the back panel.
3) Check to see if there is any interference between the connector cable and the tailpiece - excessive friction may affect the door lock's functionality and reduce its battery life.
4) Check to see if the tailpiece is placed in the center of the deadbolt hole; if not, reposition the mounting plate to make sure that the tailpiece is in the center.
5) If the problem still lingers, check to see if the door opening size meets requirements, and if the door frame's opening is on the same level as the door lock. Make sure that the deadbolt hole meets the door lock's requirements.
6) In the case that the tailpiece curves, restricting normal unlocking, please contact our customer service center.

You can use the built-in guest feature in Apple Home. In the Apple Home app, go to Home Settings → Invite Others → Add Guest to select the devices the guest can control and set their access period. You can also individually enable or restrict the guest's use of UWB or NFC to unlock the door. After setup, the guest can use the door lock only during the specified period.

The lock cylinder of the Aqara Smart Door Lock U400 is compatible with most wooden doors on the market, whose thickness is between 35mm - 55mm. For 38mm door holes, only hollow doors meet the installation requirements. Otherwise, we recommend enlarging your door hole to 54 mm for the best installation experience. For more information, please visit the official Aqara Smart Lock U400 product page.

No. The Aqara Smart Door Lock U400 supports all door-opening directions, including left/right and inward/outward.

Disassembling the Smart Lock U400 is construed as your agreement to waive the maintenance service of Aqara. If this is acceptable, take the following steps:
1) Loosen the screw of the front lock and take out the original lock cylinder.
2) Buy a new lock cylinder in the same size as the original one, then replace the original with the new one. Note: The lock cylinder used for the U400 is a less common specification and is not the same as Schlage cylinders.

Please ask a locksmith has a check if they have a suitable replacement

No, it does not. The Smart Door Lock U400 supports the Thread protocol, which is more stable than Wi-Fi and has a longer battery life.

1) In the Aqara Home app, enter Smart Lock U400 page, then enter 「Settings＞Door Lock Calibration」and follow the instructions to recalibrate the door lock's angle. Or you can remove the battery cover and press the set button to enter the door lock local settings, Verify the administrator credentials and then press '5' to enter door lock calibration. Then follow the voice prompts to recalibrate the lock.
2) Check again to see if the door lock is correctly installed.
3) If the problem still lingers, please contact our customer service center.

The Aqara Smart Door Lock U400 uses Bluetooth 5.2, Thread (Matter 1.4), NFC and UWB

1) FCC Certification
2) MFi Certification
3) Matter Certification
4) Thread Certification
5) IP65 Certified
6) BHMA Grade 3 Certified
7) RCM Certification
8) RSM Certification
9) IMDA Certification
10) IC Certification etc.