Competition in the smart lock market has evolved from simply "how to unlock" to "how to see" and "how to manage." As fingerprint recognition becomes commonplace, 3D facial unlocking is emerging as the new trend, offering a seamless and secure experience. As an expert in smart home security, EZVIZ has launched the DL31FVS and DL31FS facial recognition locks to meet this demand. While they share the same lineage and core unlocking technology, they are clearly differentiated by their "visual" capabilities. This is not a case of one model replacing the other, but rather a precise response to the varying priorities of different households.

Shared Core Technology: A Secure, Fast, and Stable Facial Recognition Experience

Both the DL31FVS and DL31FS are equipped with EZVIZ’s proprietary 3D structured-light facial recognition module. Unlike the 2D recognition used by standard smartphone cameras, this technology projects tens of thousands of invisible light points to map facial depth, effectively thwarting spoofing attempts using photos, videos, or even realistic masks. Real-world testing shows that the lock opens instantly upon approach—even in pitch-black hallways or strong backlighting—without requiring the user to pause or align their face precisely.

Both models share the same fundamental lock specifications:

Fully automatic lock body: Unlocks instantly upon successful recognition and auto-locks upon closing, eliminating anxiety about whether the door is secured.

Supports multiple unlocking methods—including fingerprint, passcode, CPU card, temporary passcode, and mechanical key—making it convenient for all family members, young and old.

Embedded EZVIZ Connect security chip: Encrypts data locally to safeguard information security at the hardware level.

Comprehensive physical and electronic security features: Includes a Class C lock cylinder, anti-tamper alarms, ajar alerts, and lockout protection after multiple failed attempts.

What truly sets them apart is whether or not they feature an "eye" that can look outward.

DL31FVS: An Eye at the Door, Visible Security

Positioned as a "3D Facial Recognition Video Lock," the DL31FVS builds upon facial recognition unlocking by integrating a 2MP ultra-wide-angle peephole camera, a doorbell function, and a large indoor display screen. This is not merely a lock; it is a comprehensive visual security system.

When a visitor presses the doorbell, a video call invitation instantly pops up on the owner's smartphone. Powered by EZVIZ Cloud Video technology, it delivers clear image quality and stable calls, while also supporting voice-changing features—allowing women living alone to respond with confidence. Additionally, it features AI-based human detection and loitering alerts; if someone lingers unusually in the hallway, the system automatically captures an image and sends a notification. The indoor HD screen allows the elderly and children to see who is at the door with a single touch, without needing to get up or reach for a phone. In short, the DL31FVS seamlessly integrates a smart peephole, doorbell, and door lock, eliminating visual blind spots at your doorstep with a single device.

DL31FS: Pure Face Recognition, Great Value

The DL31FS focuses on perfecting the "face unlock" experience. By omitting the camera and indoor screen, it achieves a slimmer profile and lower power consumption, resulting in a more accessible price point.

If your home already has an electronic peephole, or if strangers rarely loiter at your doorstep, the DL31FS offers the same seamless 3D structured-light face recognition experience at a lower cost. There is no compromise on the core experience—it delivers the same lightning-fast recognition, fully automatic locking mechanism, and multiple unlocking methods. For users who prioritize reliable, durable functionality without unnecessary frills, the DL31FS is a practical choice that directs your budget precisely toward the essential task of unlocking the door.

Battery Life and Ecosystem: Reliable Performance

Both locks utilize a dual-lithium-battery parallel power system; the main and backup batteries switch seamlessly, ensuring the lock operates normally even on a single battery. Low-battery alerts are issued repeatedly, and in the unlikely event of total power depletion, the Type-C emergency port at the bottom allows for temporary power via a portable charger to unlock the door.

As members of the EZVIZ family, both locks integrate seamlessly into the EZVIZ smart home ecosystem. Using the EZVIZ app, you can check lock logs and share temporary passwords anytime. By configuring smart linkage scenarios, the system automatically disarms the camera and turns on hallway lights the moment the door opens, while a single-touch "Away Mode" arms the system upon departure—transforming home security from isolated functions into a comprehensive, integrated system.

Which one should you choose? It depends on your needs at the doorstep.

If you want to "see who is outside before deciding whether to open the door," the DL31FVS—with its video calling, proactive detection, and large indoor display—elevates your sense of security to a new level. It is particularly well-suited for households with elderly members or children, or for homes that frequently receive deliveries and food orders.

If your priority is simply "seamless entry without the need for keys" and your entryway environment is relatively straightforward, the DL31FS is a smart, cost-effective choice; it offers top-tier facial recognition unlocking at a more accessible price point.

The EZVIZ DL31FVS and DL31FS are like two distinct moves derived from the same powerful core technology: one focuses outward to include monitoring capabilities, while the other concentrates on the lock itself, returning to the fundamental function of opening and closing. Whichever you choose, you are stepping into a lifestyle of ease and convenience where your face serves as your key.

EZVIZ 20000mAh/76Wh 3.8V 805298 Battery