Locksis Door Lock DIY Electronic Keyless Smart Lever Room Office LTTB-80 (Silver) Reliability (no residual fingerprints) - The keypad is placed on the lever and once the lever is pressed down, fingerprints will be vanished entirely. DIY - With the use of screwdriver only, anyone can install the smart lever lock on various kinds of door without having a damage on your door. Satinless Steel - The Smart Lever Lock has strong durability and fire resistant. Low Battery Consumption - Combination of analougue technology ( opening & closing process) and digital technology ( unlocking) No Condensation - Unlike other keyless door lock, the Smart Lever Lock is not affected by temperature changes.