The iulock IU-20 Code Door Lock is a versatile electronic door knob designed for reliable access control in residential and commercial spaces. Constructed with a sturdy zinc alloy housing and a reinforced steel latch, this unit offers solid build quality that withstands daily use in environments such as offices, warehouses, bedrooms, and garages. Its IP54 waterproof rating ensures protection against moisture and dust, making it suitable for both indoor and semi-outdoor applications.

The lock features a programmable backlit keypad that supports up to 50 unique user codes, allowing for flexible access management without the need for physical keys in many situations. A traditional key override mechanism is included for emergency or backup entry, providing an extra layer of security. The auto-lock function automatically secures the door after each entry, with an adjustable delay time that can be set according to user preference.

The passage mode enables free entry and exit without requiring a code, which is convenient for high-traffic periods. The lock is powered by four AA batteries, and its low-power consumption design delivers extended battery life—typically lasting up to a year under normal use—with a low-battery indicator to alert users in advance. Installation is straightforward, requiring only a screwdriver and about ten minutes to replace a standard tubular or key-in-knob lock, with all necessary mounting hardware included.

The keypad is responsive and features a durable silicone coating that resists wear and fading. The internal components are precision-engineered for smooth operation and quiet locking. This lock operates reliably across a wide temperature range, making it suitable for unheated storage areas.

The combination of affordability, ease of use, and practical features makes it a cost-effective solution for property owners seeking to upgrade their access control without investing in expensive smart systems. The IU-20 delivers consistent performance with minimal maintenance, and its straightforward programming avoids the complexity found in some digital locks.