Search  for anything...
eufy Security

eufy Security Smart Lock S231, Fingerprint Scan, Keyless Entry Door Lock, Smart Built-in Wi-Fi Lock, Bluetooth Electronic Deadbolt, Touchscreen Keypad, BHMA Certified, IP65 Weatherproof

    • Based on 3,544 reviews
Condition: Used - Like New
Checking for product changes

Notify me when this product is back in stock

$121.99 Why this price?

Buy Now, Pay Later

As low as $20.33 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Unavailable
Fulfilled by Amazon
Available payment plans shown during checkout

Recently Viewed

Color: Satin Nickel


Features

  • Your Finger is the Key: Smart Lock recognizes your fingerprint in just 0.3 seconds and unlocks your door in 1 secondits faster than fumbling for your keys.
  • Control From Anywhere: With its all-new Wi-Fi connectivity, you can control Smart Lock from absolutely anywhere via the eufy Security app.
  • Always Has Your Back: Even when youre in a hurry, Smart Lock is ready to protect your home. A built-in sensor detects when your door is closed and locks it automatically behind you, every time.
  • Multiple Ways to Unlock: Open Smart Lock using your fingerprint, with your phone via the eufy Security app, or by using the keypad or key.
  • Built to Last: With a sturdy zinc alloy and stainless steel frame, Smart Lock is tested to handle the comings and goings of a busy household for over 30 years. The IP65 rating ensures that come rain or shine, your front door is protected.

Material: Stainless Steel


Brand: eufy Security


Color: Satin Nickel


Product Dimensions: 3.94"L x 1.38"W


Number of Pieces: 1


Material: ‎Stainless Steel


Brand: ‎eufy Security


Color: ‎Satin Nickel


Product Dimensions: ‎3.94"L x 1.38"W


Number of Pieces: ‎1


Exterior Finish: ‎Stainless Steel, Zinc


Special Feature: ‎Built-in wifi, Auto lock,High Security cylinder, BHMA Certified


Included Components: ‎Rechargeable battery


Lock Type: ‎Keypad Lock


Item Weight: ‎3.1 Pounds


Handle Material: ‎Zinc, Stainless Steel


Unit Count: ‎1 Count


Number of Items: ‎1


Manufacturer: ‎Eufy


Part Number: ‎T8520


Item Weight: ‎3.1 pounds


Item model number: ‎T8520


Batteries: ‎1 Lithium Ion batteries required. (included)


Finish: ‎Painted


Item Package Quantity: ‎1


Special Features: ‎Built-in wifi, Auto lock,High Security cylinder, BHMA Certified


Batteries Included?: ‎Yes


Batteries Required?: ‎Yes


Battery Cell Type: ‎Lithium


Date First Available: May 31, 2021


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Still works great after a year
Color: Black
Review Image by Jeremy Jeremy
Review Image by Jeremy Jeremy
The media could not be loaded. We’ve had this smart lock for over a year, relying mostly on the finger print sensor, and it still works like a charm. Installation: The installation is super easy and can be completed in just a few minutes with the clear instructions. Setup is also fairly intuitive and quick. No issues connecting to wifi and getting it set up and running great. Features: The finger print sensor works great and you can add multiple finger prints for different individuals (or for your right or left hand). It occasionally miss-reads your fingerprint (about 5-10% of the time), but when it does it gives a clear visual with a red light and then generally works the very next try. The capacitive buttons also work well, it we almost always use the fingerprint sensor since it works so quick and well. We’ve never had do use the backup key, but it’s good to have it there. Battery: The battery is great and I love that it’s rechargeable rather than always having to buy new ones (like some of our other locks). Recharging it can take a few hours, but we typically plug it in at night and it’s ready to be installed the next morning. The battery generally lasts us 4-5 months. Connectivity: We’ve had zero issues with connectivity. The setup was simple and it always keeps the connection. It’s been great to be able to check the lock status while away from home and lock or unlike the door remotely. Concerns/issues: The only issues we’ve had with the lock are verity small. Occasionally we’ll need to recalibrate the lock so that it opens and closes well and all the way. Recalibrating it is very quick and simple though. Also, the clear plastic on the face of the lock seems to be separating partially from the unit. There’s no physical issue with this and it hasn’t affected the operation of the lock, but you can visually see a change in the coloring of the lock face because of this. Overall, I love this lock and have already recommended it to many friends and family. ... show more
Reviewed in the United States on October 15, 2023 by Jeremy Jeremy
    • Learning curve, works in 110 degree direct sun
Color: Satin Nickel
If installing for family they need to ensure the door is latched at the bottom before unlocking deadbolt. I observed them trying to open door at the bottom to see if unlocked and then putting fingerprint which causes deadbolt to jam and wont open. They have to pull shut then fingerprint or code. I would like to see an option to buy another battery as a backup. Otherwise you need to find a time to charge battery—maybe overnight while all asleep. Build quality is nice and unlocks quickly. When you grant guest access to someone and it emails them, they can only use the app to unlock. App should allow them to register their own fingerprint. Otherwise I have to register their fingerprint as administrator. Nice that under one person you can register multiple finger prints—I tried five with no issue. The ability to schedule a code for say cleaning crew for certain days and times is nice— can’t schedule a particular date which would be good if you have a one time vendor coming in. You get 5 Keys, which is good because these are special keys that are not easy to duplicate—no bumping or picking this lock. The deadbolt strike reinforcement plate needs 3”+ screws to ensure it grips into door frame. I do wish you could configure unlocking alerts by user vs getting an alert for every unlock event. Need search feature on the security logs so you can see all events of certain type or by user. I paired this with Yale P5101N01 Navis Paddle Passage Lever (Push/Pull to Open), Hands-Free Opening – Push with Your Hip, Satin Nickel —not a perfect match but close in color. I do like they put thread locker on bolts to secure each side but suggest they also do the same for screws for back battery box. I like the silicon seal on both sides to seal out drafts and water. Very easy install. In Dallas 110 degree direct sunlight this lock functions fine, while very hot to put your thumb on the reader it works as expected. Really happy with this after severals months of use. I like the fact you can set the auto lock function time—I have found one minute to be best. This way if I remember I can manually lock and save battery, also if just stepping out to pickup package it will not lock right away. Great to be able to turn off for a party or set it to auto lock after the party automatically in case you forget! To lock right after leaving you just tap your thump/finger on outside and it locks. ... show more
Reviewed in the United States on June 18, 2023 by JCT

Can't find a product?

Find it on Amazon first, then paste the link below.