In short, this is a great product, exceptionally easy to install and functions well enough that we decided to purchase a second. After choosing to go with Eufy's camera products for our new home, we opted to add this smart lock to our back door given that it's the one we use the most. We were also intrigued/hopeful about the fingerprint reader - with a toddler, fumbling with keys trying to get in, especially if carrying groceries, is a tedious process, and we wanted this to make life easier. Ultimately, it has done just that while providing peace of mind at all hours. The installation process is remarkably simple and the app walks you through it step by step. We found the provided strikeplate to not fit on our doorframe correctly so we left the existing plate, which caused no issues. I would absolutely recommend using the Eufy app rather than relying on Home alone (or any other Matter-connected system). The app provides far more options to customize to your needs/wants, including adding numerous entry codes and fingerprints, as well as guest-specific codes. Adding fingerprints is quite simple and closely resembles the process from older iPhone fingerprint scanning. However, keep in mind how you expect to actually scan your finger when (un)locking. The scanner works well and does learn better over time, but it is still a bit sensitive so if I try to put my thumb over it sideways or upside down, it often rejects the read because I scanned it upward originally. An easy workaround is simply adding additional prints for those respective fingers from different angles. However, it's more important for security purposes to use the app simultaneously with Home/Matter because the app is more reliable and consistent. I have never had the device disconnect from Home or not be reachable/usable, but I don't always get notifications when the door (un)locks from Home. The Eufy app is more reliable in this way, not only pushing alerts immediately but also notifying who is doing it when it happens from outside (by fingerprint) or how it failed. I believe some of their newer premium locks perform better with Matter in this way, but ultimately it's not a deterrent for me given that Home still consistently shows the status and allows me to (un)lock the door directly, and I use the app already for the other Eufy products. In all, although not always flawless in execution, the lock works really well. The battery is long lasting still showing full bars of charge after two full months of use, and the fingerprint reader is a nice addition that works on first try the majority of the time but the personalized codes are a phenomenal backup with a key as a tertiary option. We purchased a second lock recently for our other door simply to add the peace of mind knowing when the doors are locked, as well as being able to autolock at night. I'd highly recommend, ESPECIALLY if you're already bought into the Eufy system.

[This review was collected as part of a promotion.] Great product the battery life has been good and we have never had an issue. Installation was simple too! Very happy with it overall and highly recommend it.

[This review was collected as part of a promotion.] I haven’t had a Smart Lock before. At first, the kit included everything you need to install the lock. Also there is kit of keys for the lock if you want to use it on the old man. It’s easy to install. I like that I can give access to my house remotely and I still don’t have to carry those keys from the kitchen. Can’t say anything about the battery life yet except that it’s here. I think the price to quality ratio of this lock is excellent

[This review was collected as part of a promotion.] This smart lock is amazing! The installation process was simple! Battery life of 14 months is great! It’s very compatible and user interface friendly! Security features will keep you safe! Highly recommended!

[This review was collected as part of a promotion.] ⭐⭐⭐⭐⭐ The Eufy Smart Lock E31 is an absolute game-changer! The fingerprint unlocking is lightning-fast (less than a second), and it keeps getting smarter with each use. I love having multiple ways to unlock the door—fingerprint, Eufy app, keypad, voice commands (Siri, Alexa, Google Assistant), or even a physical key as a backup. One of the best things about this smart lock is its seamless compatibility with my existing smart home setup. It integrates effortlessly with Alexa, Google Assistant, and Siri, making it super easy to control access with voice commands. The real-time notifications and remote unlocking through the app are incredibly convenient, especially when I need to let someone in while I’m away. Installation was a breeze—only about 15 minutes with no drilling required—and the battery life (up to 14 months) is impressive. Even if the battery runs low, I can use a portable charger to power it up temporarily. The BHMA-certified durability and weatherproof design mean it holds up against all conditions, keeping my home secure year-round. If you’re looking for a smart lock that’s fast, secure, easy to install, and fully compatible with your smart home devices, the Eufy Smart Lock E31 is a perfect choice. Highly recommend!

[This review was collected as part of a promotion.] This product is exactly as pictured. It is easy to install. Not sure of battery life yet, but if I have issues I will contact the company. I like that you can unlock it with your phone,(apple), or with a physical key. It alerts you when the door has been unlocked. I would recommend this product. Great quality and easy install.

So far so good. The battery did not last one year. Installed it in July and battery was drained by October. We charged it and it worked. While charging we just used the keys that came with it. Finger print is good. Code is good as well. We used temporary codes for the in-laws. Good product.

[This review was collected as part of a promotion.] Works perfect and easy to install! I have not had any issues with battery life yet it says a 14 month battery life and I’ve had it installed for about 2 weeks so I can’t say too much on battery life. The app is easy to use very simple straight forward. Comes with everything you need for quick easy installation. It auto locks if you forget.

[This review was collected as part of a promotion.] This smart lock was easy to install and it paired well with the App. I had no issues with removing my old lock and installing this new lock which was a pleasant surprise. It's great for feeling secure in the house and also when leaving so it gives a sense of extra protection. It works well with the app and it's a plus when I have friends/family that come over because I can give them a code to come in, instead of finding a spare house key.

[This review was collected as part of a promotion.] I have been quite impressed with the performance of the smart lock. The app connectivity is seamless, providing real-time notifications that enhance my awareness of access activities. I have not experienced any issues with unlocking, and the lock integrates effectively with my existing smart home system. However, I must note that the installation process did present certain challenges. Given the high quality of the product, the instructions could benefit from improved clarity, as I had to make several adjustments before achieving a successful installation. Once correctly installed, the lock has functioned flawlessly. The system has a sturdy, high-quality feel that adds to my appreciation for it. Regarding battery life, I have not encountered any problems so far, although it has only been a few weeks since installation. If the setup process had been more straightforward, I would have confidently rated this product a full five stars. Overall, I am very satisfied with my purchase.