Voice Guide Feature The voice guided operating manual for easier and more convenient use. Automatic Locking The Yale smart digital lock series automatically locks the door after checking it is properly closed. Fake PIN Code To prevent the PIN code from being exposed, It allows you to enter fake numbers before or after entering your PIN code. Low Battery and Emergency Power Low battery warning with alarm and LED. When the batteries are completely discharged, you can easily supply emergency power to the lock with the standard 9V battery. Remote Control (Optional) Remote Control type is also available. Wireless Floating ID technology is adopted and works up to 50m.