The eufy FamiLock S3 Max is a Grade 1 deadbolt with palm-vein unlock, a 2K HDR doorbell camera, and a 4-inch interior rear screen. eufy lists infrared palm-vein recognition, about 150° coverage, PowerDuo (15,000 mAh plus four AAA), IP65, and −22°F to 158°F.

Door fit is 35–55 mm. Storm doors that block the camera are discouraged. The lock is not compatible with HomeBase 2. Camera streams are not supported via Matter; full video stays on the eufy app. Matter with HomeBase 3 is listed for simultaneous use.

Pros
– The S3 Max is a Grade 1 deadbolt with palm-vein unlock, a 2K HDR doorbell camera, and a 4-inch interior rear screen
– Door fit is specified at 35–55 mm thickness

Cons
– Doors outside 35–55 mm thickness do not fit
– Storm doors that block the camera are discouraged, and the lock is not compatible with HomeBase 2

eufy FamiLock S3 Max

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Where to buy (prices as of 2026-08-23)