A shared code you cannot audit, against one you can change and track.
Verdict
A mechanical combination box is cheap, has no battery and works forever, and once you give out the code you have no idea who has it. A smart box issues one-time or scheduled codes and logs access, which is what accountability to a seller actually requires. Use the combination box for vacant land, sheds and low-risk access; use the smart box on occupied listings where you need a record.
~$130
Check igloohome Waterproof Smart Lockbox Price| igloohome Waterproof Smart Lockbox | Master Lock Portable Key Lock Box | |
|---|---|---|
| Access log | Yes | No |
| One-time codes | Yes | No |
| Battery | Yes, needs monitoring | None |
| Code changes | Remotely | Manually, at the box |
| Weather resistance | Rated | Varies |
| Cost | Higher | Low |
The property is occupied, valuable, or the seller wants to know who came through. A code you can issue for a two-hour window and revoke afterwards is a very different thing from a four-digit code that circulates through an office for months.
Check igloohome Waterproof Smart Lockbox on Amazon
The access is low risk and you want something that will never fail. A mechanical box has no battery to die in the cold and costs a fraction as much, which is why most agents keep several regardless of what else they use.
Check Master Lock Portable Key Lock Box on Amazon
Many do, and some require a proprietary system for MLS-listed properties. Check your local rules before buying anything, because a box your association does not recognise may not be permitted on a listing at all.
Most have a backup access method, and you should know what yours is before you need it. Check the battery at every showing cycle, because discovering a dead box with buyers at the door is the failure mode.
They resist casual entry, not determined attack, and the bigger weakness is code sharing rather than the mechanism. Change the code between listings and never reuse one across properties.
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these units side by side. Confirm current prices and specifications before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Deciding on a specific model? We review the Igloohome waterproof smart lockbox review in full.