Service Assurance: 24X7 Toll free Customer Support helpline for Free Installation* & Service Support. Toll Free: 18001035606. * T&C Applied;YDME 50 Compact Look allows it to be used for internal/bed room doors as well.;Various access allows it to be conveneiently used in small hotels also.;Jump Start: Allows you to re-operate the lock from outside in-case of the battery is depleted. This feature can be used by using a 9V battery with the front panel;