"It uses the latest biometric entrance technology with 150 fingerprints storage capacity for single latch tubular model. It can replace any standard door locks and can be installed by DIY (do-it-yourself). This fingerprint door lock offers a sliding front cover that not only allows protection for the optical sensor but also activates the fingerprint scanner when lifted and it can be accessed by fingerprint, pass code, or backup key. Powered by 4 AA batteries which will handle 15,000 usage. With the fingerprint recognition technology, you can easily give your children or other family members access to your home without needing to worry about them losing the keys."