Keyless Mechanical Turn Lock Deadbolt Lock (This is not an e-lock): You can ask your family or friends to lock the door with a simple turn when you get the keys; An Anti-Lock Knob on the outside knob mechanically guards against unwanted turns, giving you full control over the "turn to lock" feature; This means that you can lock the Anti-Lock Knob when you don't need the "turn to lock" mechanism feature, then the "turn to lock" feature is eliminated. .A robust security mechanism integrated into the inside knob provides enhanced security, providing peace of mind that can't be stolen even if the previous tenant keeps their keys; .Based on the classic mechanical Deadbolt design, we've added some great features that give you more options. This Deadbolt a series of selectable functions . .The turn to lock mechanism is especially useful for the elderly, children, disabled, people who are busy with apartment front door, garage door, side door, shed door, basement door, apartment back door and residence door, .BUILT LIKE A TANK: Made of super sturdy 304 stainless steel casting, which is highly rated by famous expert in lock industry, Lock-Picking-Lawyer on YouTube; NEVER FADE AND NEVER RUST and almost no wear with lathe coating after casting from 304 stainless steel, no paint, e-coating, oil and stoving varnish, not like Zinc Alloy and lathe is more environmentally friendly for easy recyclable use;