Gimdow smart lock helps people to update their existing door locks in a simple and fast way. By sticking Gimdow smart lock on the inside of the door lock, instead of dismantling, people can lock and unlock the door through smartphones and keypad. No modification of the existing lock or door is required. It stays securely in place for as long as you need it, but comes right off when you move to a new place or encounter an emergency. Moreover, the Gimdow app helps you to issue and withdraw virtual keys remotely, receive notifications and check to unlock records. With swappable inserts, Gimdow can be fitted on most American or European door locks, so you can turn any ordinary lock into a smart one!