Smart Door Lock Price in Bangladesh, Smart Door Lock at lowest prices at Dhaka, Buy Smart Door Lock in BD. A smart lock is arguably the most important part of a truly smart, connected home. Not only will it allow you to come and go as you please, it will also monitor who is entering and leaving your home while you’re away. Some models simply let you use your phone to open and close doors. Some let you assign special privileges to friends, family members, or maintenance staff.