IU-20 Code Door Lock Electronic Door Knob with Keypad - Keyless Entry

In this review of the IU-20 Code Door Lock, the bottom line is simple: it is a practical, budget-friendly keyless knob suited for rental properties, garages, offices, and interior doors where convenience and multiple user codes matter most. The standout reason to consider it is the keypad's ability to store up to 50 user codes and a master code, which makes managing access easier than shared keys. Installation is straightforward and the backlit keypad and auto-lock feature make daily use convenient, though real-world durability opinions are mixed.

Key Features

• Keyless Entry: Stores up to 50 user access codes and one master code so multiple people can have unique PINs without physical keys.
• Ergonomic Design: The easy-to-grasp knob and simplified exterior fit both interior and exterior doors while offering a modern look.
• Weatherproof Build: IP65 rating means the lock resists water and works in variable weather at entrances, side doors, or garages.
• Auto-lock & Modes: Auto-lock, silent mode, and a passage function provide flexible operation for different door use patterns and privacy needs.
• Backup Options: Low battery warning, USB-C power-backup when batteries die, and included mechanical backup keys reduce lockout risk.
• Universal Fit: Adjustable latch and free rotating knob fit standard door thicknesses and both left and right handed doors for easy replacement.

Who It's For

This lock is best for property owners who need simple, code-based access control without wiring or advanced smart-home integration. Landlords, small-business operators, and homeowners who want to avoid shared keys will appreciate the ability to set many temporary or permanent codes and the straightforward installation with just a screwdriver.

It is less suited for buyers who require professional-grade commercial locks with exhaustive durability records or those who need wireless app control and remote management. Some customers reported mixed long-term reliability, so users needing mission-critical, 24/7 secure operation should consider a higher-end specification.

Pros & Cons

Pros

• Easy to install and program, with a backlit keypad that simplifies setup in seconds.
• Supports up to 50 codes, ideal for rentals or shared access without key distribution.
• Solid metal construction and IP65 weatherproofing give confidence for exterior use.
• Multiple operation modes and USB-C backup reduce lockout risk and add convenience.

Cons

• Some users report inconsistent locking behavior and mixed durability feedback over time.
• USB-C backup cable is not included, which is an extra purchase risk if batteries fail unexpectedly.

Specifications

Product type	Electronic keypad door knob
Code capacity	Up to 50 user codes + 1 master code
Code length	4 to 15 digits
Weather resistance	IP65
Door thickness	1-3/8 in to 2-1/2 in
Latch options	2-3/8 in or 2-3/4 in adjustable latch
Backup	Mechanical keys and USB-C emergency power

Our Verdict

The IU-20 is a sensible value pick for anyone who needs flexible code management and a straightforward retrofit for standard doors. It combines keyless convenience, weather resistance, and easy installation into a compact package, making it a good choice for rental units, garages, and interior doors; buyers who need commercial-grade longevity or remote app control should compare higher-tier alternatives.

Frequently Asked Questions

How many codes can I store?
You can program up to 50 user codes plus one master code, with codes 4 to 15 digits long.

Will it work on left and right handed doors?
Yes, the free rotating knob and adjustable latch allow installation on both left and right handed doors and common door thicknesses.

What happens if the batteries die?
The lock has a low battery warning and accepts USB-C external power for emergency use; mechanical backup keys are also provided.