Smart Key Lock Box Lockin K421

Lockin K421 Smart Key Lock Box — A Simple, Secure Way to Store Spare Keys

No more hiding spare keys under the doormat or behind a flowerpot.
With the Lockin K421, your keys stay in one secure place whenever someone needs them. Open this smart key lock box using a personal access code or Bluetooth on your phone.

The K421 works well at home, in the office or at a rental property — anywhere you need to share access without handing over a physical key. It is easy to install, straightforward to use and tough enough for everyday use. The Lockin K421 is a simpler alternative to the K441. It does not have a fingerprint reader and opens using a code or Bluetooth.

When is it useful?

• When you need to leave keys safely for family, guests or tenants.

• If you manage an Airbnb, Booking.com listing or rental property — give each guest their own access code.

• If keys often go missing and you want one secure place to keep them.

• If you want a simple, modern solution that saves time and makes sharing keys less stressful.

Main features

• Access by code or Bluetooth — enter your code at the box or unlock it from your phone when you are nearby.

• Easy app management — create and remove codes, check access history and change the settings when needed.

• IP65 protection — suitable for indoor and outdoor use, including beside a front door or gate.

• Up to 24 months of battery life — no wiring and no need to replace the batteries every few weeks.

• Strong metal body — made to handle bad weather and attempts to force or damage the box.

• Up to 100 unique codes — useful for families, offices, guests or several regular users.

• Quick to install — attach it with screws or the included mounting bracket and start using it.

Why choose the Lockin K421?

• Your spare keys always have a place — no more searching for them or wondering where you left them.

• Simple local access — unlocking is quick and does not depend on a constant internet connection.

• No professional installation needed — you can fit it yourself in a few minutes.

• Neat, compact design — it does not look bulky or out of place beside a door.

• Useful in many situations — suitable for homes, businesses and rental properties.

Where can you use it?

• Beside a house or flat door — keep a spare key ready for family members or guests.

• At an office or warehouse — give access only to the people who need it.

• At Airbnb, Booking.com and other rental properties — let guests check in without arranging an in-person key handover.

• By a gate, garage or outbuilding — keep the keys nearby without leaving them somewhere obvious.

Why you will like the Lockin K421

Because it makes storing and sharing keys much easier.
No wires, no complicated setup and no more hiding spare keys in unsafe places — you decide who gets access and when.
A straightforward way to keep your keys secure and close at hand.