August Wi-Fi Smart Lock (4th Gen) Review
Our verdict
The August retrofit lock is the renter's answer: it clamps over your existing deadbolt's interior side, so your keys and landlord stay happy. DoorSense tells you if the door is actually closed, and auto-unlock triggers as you approach.
Pros and cons
What we like
- Retrofits existing deadbolt — no rekeying
- DoorSense open/closed detection
- Auto-lock and auto-unlock
What could be better
- CR123 batteries last ~3 months
- No built-in keypad (add-on extra)
Full specifications
| Security rating | Retrofit (keeps existing deadbolt) |
| Connectivity | Built-in Wi-Fi |
| Unlock methods | App, auto-unlock, guest access, physical key (existing) |
| Access codes | Unlimited guest access via app |
| Auto-lock | Yes, with DoorSense |
| Smart home | Alexa, Google, Siri, HomeKit |
| Battery | 2x CR123 (~3 months) |
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Check price at eufy via ImpactLast updated 2026-10-02. Price checked 2026-10-02 — confirm at the retailer.