I. Core Security & Convenience

1. Full-Automatic Locking Mechanism

   • Locks automatically when the door is closed, no manual operation required, providing instant security protection.
   • Supports dual locking modes: default auto-locking mode and normal open mode (convertible to a regular door handle, ideal for elderly/children with frequent access).

2. Maintenance-Free Mechanical Structure

   • No power supply or wires needed, completely eliminating the risk of electronic device failures, suitable for complex outdoor environments like courtyards.
   • Double-sided symmetrical design prevents violent opening from the outside, optimized for high-security scenarios.

II. Flexible Adaptability & Installation

1. Multi-Size Compatibility

   • Fits door thicknesses from 1.4 inches to 2.5 inches (35-65mm), covering most residential/commercial doors.
   • Comes with 4 sets of spindles and screws in different lengths (2.1"/55mm, 2.4"/63mm, 2.7"/71mm, 3.1"/79mm), no additional accessories needed for installation.

2. Quick Replacement Design

   • Adjustable door handle + push-pull latch structure (2.3"/60mm or 2.7"/70mm), enabling old lock replacement within 10 minutes.
   • Extra-large backing plate (6.2×2.5 inches/160×65mm) hides installation holes, keeping the door neat and aesthetic.

III. Durability & Material

1. Military-Grade Material & Craftsmanship
   • Main body made of zinc alloy die-casting with multi-layer electroplated coating, corrosion-resistant and scratch-resistant, capable of withstanding extreme temperatures from -20℃ to 70℃.
   • Lock cylinder passed 100,000 opening-closing tests, service life far exceeding industry standards, suitable for long-term outdoor use.

IV. Humanized Details

1. Mute Buffer Design
   • Built-in spring buffer in the latch reduces noise when closing the door, avoiding disturbing family members.
   • Anti-slip texture on the password dial, allowing easy operation even with gloves or in humid environments.

V. Installation Accessories List

• 4 sets of spindles (2.1"/55mm, 2.4"/63mm, 2.7"/71mm, 3.1"/79mm)
• Stainless steel screw pack (adapts to different door thicknesses)
• Installation manual (with QR code for video tutorials)
• Emergency mechanical keys (2 pcs)

Application Scenarios

• Outdoor scenarios such as courtyard gates, garage doors, warehouse doors
• Places with multiple users like homestays and offices
• Family residences requiring high security and durability

Summary: Through mechanical structure innovation, this lock excels in maintenance-free performance, adaptability, and durability, especially suitable for outdoor scenarios pursuing stable security. Multi-size compatibility and quick installation design greatly lower the usage threshold, making it an ideal alternative to traditional electronic locks.