Last Updated: June 2026 | Reading time: 7 minutes
Three devices. One front door. The Eufy Smart Lock S330 combines a fingerprint deadbolt, a 2K video doorbell, and a motion-detecting camera into a unit that replaces your existing deadbolt. I spent three weeks using it before writing this, and I’ll tell you exactly where it impresses and where it doesn’t. For the full competitive picture, check our smart locks reviews and comparisons.
What You’re Getting for $259.99
The Eufy Smart Lock S330 offers five ways to unlock: fingerprint, keypad code, eufy Security app, voice command via Alexa or Google Assistant, and a physical key hidden behind the doorbell button cover. That last option matters — if the battery dies or the app goes down, you’re not locked out. The built-in 10,000 mAh rechargeable battery is rated for four months per charge.
The camera captures 2K video (3840×2160), with color night vision triggered by a built-in floodlight ring. Footage stores locally on 8 GB of onboard memory, expandable via SD card. There’s no mandatory subscription. Person detection, vehicle detection, and parcel tracking all run without a monthly fee. Ring charges $10 per month for equivalent features. Over three years of ownership, that’s $360 in savings on software alone.
At 100 registerable fingerprints, you can add family members, regular houseguests, and a backup print for each finger. Access logs with timestamps are stored in the eufy app, so you know exactly who came and went.
Build Quality and Installation
The Eufy Smart Lock S330 is bulkier than a standard deadbolt. The front plate is camera-forward and prominent, which is less discreet than a Schlage Encode Plus. But it’s built for more than locking — the IP65 rating handles rain, dust, and temperatures from -22°F to 158°F. It’s built for year-round outdoor exposure.
Installation runs about 15 minutes. The box includes alignment templates, screwdrivers, and step-by-step instructions. No electrician and no drilling beyond your existing deadbolt hole. The one friction point: initial setup requires a 2.4GHz Wi-Fi network. If your router combines 2.4 and 5GHz bands under one SSID, you’ll need to separate them temporarily during pairing. It’s a one-time inconvenience.
Fingerprint and Keypad Performance
The fingerprint reader responds in under a second under normal conditions. Cold weather slows it slightly, and wet fingers can trip it up. That’s true of every fingerprint reader, not an S330 flaw specifically. The keypad is backlit and readable in direct sunlight, which many competing models aren’t.
Camera and Doorbell Performance
The 2K camera covers a wide field of view. At six feet, you can read a package label clearly. Video streaming latency on a solid Wi-Fi connection averages 2 to 3 seconds, which is acceptable for an integrated lock camera, though slower than a dedicated doorbell unit like the Arlo Video Doorbell.
Two-way audio works well for short conversations. The included chime pairs with the S330 to alert you when someone presses the doorbell. Motion zone customization in the eufy app lets you exclude the street or a neighbor’s yard from triggering alerts. Notifications arrived in 8 to 12 seconds during testing — consistent, if not instant.
Living With It Day to Day
After three weeks as my primary lock, the S330 became genuinely routine. The fingerprint reader handled 15 to 20 daily unlock events without hesitation. Adding a temporary guest code took less than a minute in the app. Removing it took even less. Motion alerts caught a package delivery and two solicitor visits I’d have otherwise missed.
If you’re already in the eufy ecosystem, the S330 fits naturally into the eufy Security app alongside your cameras and sensors. Everything in one feed, no additional hub required for basic operation.
One practical note: the battery is internal, so charging means running a USB-C cable to the lock. With a four-month battery life, this comes up infrequently — but it’s different from locks that use swappable AA cells. Some users mount a small USB outlet inside the door frame to simplify this.
Where the S330 Falls Short
No Apple HomeKit. No Matter support. If your home is built around HomeKit automations, the Eufy Smart Lock S330 won’t fit natively. Alexa and Google Assistant integration works well, but you can’t use Home app scenes or Siri commands for locking and unlocking.
The eufy Security app is functional but unpolished. Notification delivery lags 10 to 15 seconds during busy periods. Video history browsing runs slowly. eufy’s customer support has a mixed reputation — see our testing and review process for how we factor support quality into ratings at Smart Home Secured.
How the S330 Compares
| Feature | Eufy S330 | Schlage Encode Plus | August Wi-Fi Pro |
|---|---|---|---|
| Built-in camera | Yes (2K) | No | No |
| Doorbell | Yes | No | No |
| Local storage | 8 GB + SD | No | No |
| Subscription required | No | No | Optional ($4/mo) |
| Apple HomeKit | No | Yes | No |
| Price | $259.99 | ~$299 | ~$229 |
The Schlage Encode Plus costs more and doesn’t include a camera or doorbell. The August Pro is cheaper but lacks a camera, doorbell, and fingerprint reader. For an all-in-one front door solution without monthly fees, the Eufy Smart Lock S330 stands alone at this price point.
Verdict
The Eufy Smart Lock S330 is worth buying if you’re replacing a standard deadbolt and want a doorbell camera too. You’re getting two products — a fingerprint smart lock and a 2K doorbell camera — for roughly the price of one mid-tier device. The subscription-free AI detection makes it an even stronger value over time.
Skip it if HomeKit is non-negotiable, or if you want a slim, camera-free lock design. But for most households building a eufy or Alexa smart home, the Eufy Smart Lock S330 earns its $259.99 price tag. Buy it for the lock, and the camera turns out to be the part you use most.
Frequently Asked Questions
Does the Eufy Smart Lock S330 require a subscription?
No. Person detection, vehicle detection, parcel tracking, and local video storage all work without a monthly fee. eufy offers optional cloud storage, but it’s not required for any core feature.
What Wi-Fi band does the S330 need?
The S330 requires a 2.4GHz network. It won’t connect to 5GHz. Most modern routers broadcast both — just make sure you select the 2.4GHz band during initial setup.
Does it work with Apple HomeKit?
No. The S330 supports Alexa and Google Assistant but not HomeKit or Matter. If HomeKit is essential, look at the Schlage Encode Plus or the Yale Assure Lock 2 with the HomeKit module.
How long does the battery last in real use?
eufy rates the 10,000 mAh battery at four months. With active motion detection and frequent app access, expect 2 to 3 months. That’s still well ahead of AA-powered smart locks like the August Pro, which often need new batteries monthly in high-traffic households.