1. No hole lock design, completely rejecting the traditional key and lock, in the fully open and closed by remote control, realized the real security.
2. Extended antenna, stronger, safer and more receptive signal.
3. Add USB external power function. Make sure the lock works when the battery (not included) is dead.
4. Three optional unlock modes: remote control unlock, interior button unlock, phone app unlock.
5. Easy installation on all kinds of doors, very convenient.
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