eufy FamiLock S3 Max Palm Vein Unlocking: Achieve recognition in just 0.1 seconds with secure, forgery-proof palm vein technology. Your palm vein data is stored locally on the lock, keeping your privacy entirely in your hands. This all-in-one device: This smart lock features a 2K HD night-vision camera, a 150° wide-angle video doorbell, and a smart lock with real-time alerts—keeping your home secure. The Rear Lock Video Screen: The Video Screen lets you easily check the front door without an app, offering a simple, intuitive design perfect for seniors and children. Dual Power Supply System: With two batteries, enjoy up to 5 months of total usage, plus 4 AAA backup batteries for uninterrupted performance during power outages. Smart Display E10 Instant Hands-Free Door Alerts: When someone rings the doorbell, unlocks the door, or is detected by the camera, the display automatically lights up with a live feed and a voice alert. See Everything with Four Views on One Screen: View your entire property at a glance through four simultaneous live feeds while maintaining full control and near-instant access to live video streams. Instant Playback, No Waiting, No Buffering: Historical events are automatically downloaded to local storage so you can replay past moments instantly-no delays, no buffering. Video Doorbell E340 Dual Cameras, Double Security: Two cameras work together to deliver advanced viewing. The front-facing camera focuses on people, while the downward-facing camera fills in the gaps with a view of the floor in front of your door. Color Night Vision for a Clear View : Introducing the industry's first dual-light system paired with an advanced light capturing and processing algorithm. Less blur than previous iterations of night vision and a clear nighttime viewing distance of up to 16ft (5m). See What Matters in 2K Full HD Clarity: 2K clarity reveals more details. Get clear and detailed visuals of your doorstep and anyone who drops by. Battery or Wired, Your Choice: Battery mode makes installation easy. Keep a spare quick-release battery for quick swaps and avoiding downtime due to charging. Wired mode is also powered by the battery, which is topped up by the wired power source for long-lasting performance. Note: Wired mode requires the battery to be installed and a power source power should be connected with 8 to 24V and >10VA.