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August Smart Lock (4th Gen)

August Smart Lock (4th Gen)

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$20.00at eBayObserved at 1:53 PM

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Our take on the August Smart Lock (4th Gen)

The August Smart Lock (4th Gen) replaces the inside half of your existing deadbolt, so your keys still work and your door keeps its outside hardware. It adds Bluetooth keyless entry, auto-lock and auto-unlock, and DoorSense, which reports whether the door is actually closed. It carries an ANSI Grade 1 security rating, the top residential grade. The best new price is $20.00 at eBay as of November 4, 2026, far below what this lock has sold for elsewhere, so check that the listing is new and complete.

Best forRenters who can't change the outside of the doorHomes with an existing single-cylinder deadboltFamilies and dog walkers who need keyless entryAnyone who wants auto-lock and door-open alerts
Pros
  • Retrofits over the existing deadbolt, so outside keys still work
  • Auto-unlock as you arrive and auto-lock after you leave
  • DoorSense tells you if the door is open or ajar
  • ANSI Grade 1 security rating
  • Bluetooth means no hub needed for basic use
Cons
  • Bluetooth only: no Wi-Fi or remote access without a separate bridge
  • No keypad in the box; keyless entry needs the app or an add-on keypad
  • Needs a screwdriver and some assembly at install
  • Only fits single-cylinder deadbolts, not mortise or rim locks
  • Battery life depends on how often auto-lock and auto-unlock trigger

August Smart Lock (4th Gen) prices at every store

  • eBayNew

    Availability unknownSold by electrotes01

    $20.00Observed at 1:53 PM
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August Smart Lock (4th Gen) price history

Lowest price we've seen: $20.00 on Nov 4 at eBay. Tracked across 1 store since Nov 4.

What reviewers say

Owners of August locks generally like the retrofit design and the convenience of auto-unlock, and the 4th Gen is seen as a solid, simpler update. Common complaints center on Bluetooth range, app setup, and battery drain from frequent auto-lock.

Pros
  • Keeps existing keys and outside hardware
  • Auto-unlock works well when it works
  • Simple install on a standard deadbolt
  • DoorSense open/closed status
Cons
  • Bluetooth range and connection drops
  • App setup and pairing can be fussy
  • Battery drain with auto-lock on
  • Remote access needs extra hardware

Specifications

Type
Smart Lock
Height
4.8 inches
Width
6.6 cm
Depth
1.63 inches
Color
Silver, Dark gray
Compatible With
Existing deadbolt
Material
Metal
Design Finish
Powder Coated, Painted
Design Style
Bluetooth
Installation Method
Retrofit deadbolt lock
Hardware Type
Lock
Included Hardware
Hardware
Performance Security Rating
ANSI Grade 1 (Best)
Typical Users
Friends, Dog walker, Family
Smart Connectivity
Yes
Wireless Technology
Bluetooth
Assembly Required
Yes
Assembly Tools Required
Screwdriver

Questions and answers

Is the August Smart Lock (4th Gen) worth it?
It is a good fit if you want keyless entry without changing your outside lock and you are fine with Bluetooth-only control. At $20.00 at eBay as of November 4, 2026, it is cheap enough to try, but confirm the listing includes the mounting hardware and DoorSense sensor.
How is it different from the August Wi-Fi Smart Lock?
The 4th Gen uses Bluetooth only, so you control it in person or nearby. The Wi-Fi model adds built-in Wi-Fi for remote access and status checks without a bridge, and it is a different, larger form factor.
Does it work with my existing deadbolt?
It fits most single-cylinder deadbolts and replaces only the interior thumb turn. It does not fit mortise locks, rim locks, or double-cylinder deadbolts, so check your lock type before buying.
Do I need a keypad or hub?
No for basic use: the app over Bluetooth handles locking and unlocking. A keypad is sold separately for code entry, and a Wi-Fi bridge or the August app's bridge support is needed for control when you are away.
What is in the box?
The lock, mounting plate and adapters, DoorSense sensor, batteries, and screws. You supply a screwdriver. Assembly is required, but it typically takes about 15 minutes.
When is it cheapest?
August locks drop around major sales and when a new generation launches. The $20.00 eBay price as of November 4, 2026 is unusually low, so compare condition and included parts before buying.
Where is the August Smart Lock (4th Gen) cheapest?
At eBay, for $20.00, as of our latest check.