Smart lock connections
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Aqara U400 U400 UWB Smart Lock
Features
- True Hands-Free Unlocking with UWB Technology
- All-in-One Unlocking Options
- Matter Over Thread for Multi-Ecosystem Compatibility
- Convenient Rechargeable Power System
- Certified Security & Outdoor Durability
- Unlock More Features with the Aqara App
General specs
- Brand: Aqara
- Model: U400
- Seller: Retailer
- ID: B0FRS6T6HL
- Weight: 0.88 lbs
- Material: Black
- Rekeyable: Yes
- Dimensions: 5.4 x 3.2 x 1.7 in
- Battery Life: 6 months per charge
- Battery Type: Rechargeable lithium
- Charging Port: USB-C
- UWB Frequency: Ultra-Wideband
- Unlock Methods: UWB hands-free, Apple Home Key, Fingerprint, Touchscreen Keypad, Voice assistant, App remote, NFC card, Physical key
- Required OS Versions: iOS 18.5+, watchOS 11.5+
- Smart Home Protocols: Matter, Thread, HomeKit, Alexa, Google Assistant, Home Assistant
- Security Certification: BHMA certified
- Usage Temperature Range: -4°F to 122°F
- Water Resistance Rating: IP65
- Compatible Apple Devices: iPhone 11 or later (excluding iPhone SE & iPhone 16e), iPhone 11 or newer (excluding SE and 16e), Apple Watch Series 6 or later (excluding SE), Apple Watch S6 or newer (excluding SE), HomePod 2nd Gen, HomePod mini, Apple TV 4K 2021/2022
- First listed by seller: April 27, 2026
If you are interested in more details, you can find full information on the seller's page.
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Shipping options
Delivery to 
United States
United States
Available
For hands-free access when your hands are full or the weather is bad, the Aqara U400 Smart Lock uses UWB technology to unlock as you approach your door. It's like having a personal doorman who recognizes you instantly, even in the rain.
Setup was straightforward with the Aqara app, and the Matter over Thread support connects easily to Apple Home, Alexa, and Google. The best part is never fumbling for keys—you can walk right in with groceries or when it's pouring. The lock also offers multiple backup options: fingerprint, keypad, Apple Home Key, and a physical key. The rechargeable battery lasts months and charges via USB‑C without removing the lock. Plus, the IP65 rating means it handles the elements without issue.
For families, the Night Latch mode adds security by only allowing admin or key unlocking at night. If you have an Aqara doorbell, you can see who's at the door and let them in from the app. It's a practical upgrade that makes daily entry effortless and secure.
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| Brand | Aqara | ULTRALOQ | Aqara | SMONET | ULTRALOQ | LNDU |
| Model | U400 | Bolt Fingerprint | U300 | AH1 | Bolt NFC | |
| Rating |
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| Price | €240.97 | €133.87 | €182.95 | €93.26 | €133.87 | €108.09 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Jun 24, 2026 | Jun 24, 2026 | Jun 24, 2026 | Jun 19, 2026 | Jun 19, 2026 |
| Battery Life | 6 months per charge | Up to 1 year typical use | 10 months | up to 1 year | ||
| Battery Type | Rechargeable lithium | 8 AA batteries | 4 AA alkaline batteries | Battery backup (not specified) | 8 AA batteries | |
| Unlock Methods | UWB hands-free, Apple Home Key, Fingerprint, Touchscreen Keypad, Voice assistant, App remote, NFC card, Physical key | Fingerprint ID, Anti-peep Passcode, App, Auto Unlock, Voice Control, Key, Web portal | Apple Home Key (NFC), Fingerprint, Passcode, IC Fob, App Control, Mechanical Key | Apple Home Key, Fingerprint, Keypad, App, Fobs, Physical Key, Voice Control | ||
| Security Certification | BHMA certified | BHMA Certified (Highest rating) | BHMA Certified Highest Rating Residential Security | |||
| Weather Resistance | IP65 rated | IP64 | IP65 rated, All-weather performance | |||
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