Various Access : YMF 40 has multiple options to access the lock- RFID Card, Pin Code, Key Override, Bluetooth (via Yale Link app). Voice Guide Feature : As the voice guide is offered that let you know the operation status how to set each features, mode for easier and more convenient use. Operation status notification - Whenever any operation is made, the keypad informs you what is happened through different alignment of the numbers. Internal Forced Lock : It is a security-enchancing function that 'disables' authentication methods such as passwords, RFID cards and fingerprints from outside when setting up functions indoors. Low battery alarm and emergency power supply terminal : It warns in case of low battery with alarm and LED. When the batteries are completely discharged, you can easily supply emergency power to the lock with a standard 9V battery. Service Assurance: 24*7 Toll free Customer Support helpline for Installation & Service Support.