Cratejoy: Discover Unique Subscription Boxes for Every Interest

Lock Box

Lock Box - Main image
$18.59 $29.99 In stock

Lock Box Alarm System



Secure your valuables with this innovative DIY project!



• Learn rhythm, notes, and frequencies


• Explore two types of audio outputs


• Create a custom alarm for your lockbox


• Triggered when opened without a code



Perfect for budding engineers and security enthusiasts. Enhance your skills while protecting your belongings!

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (4.6 / 5 · 5 reviews)

John B. ★★★★★

I was impressed by how the custom alarm feature actually let me set specific frequency patterns for triggering. The dual audio outputs made it easy to hook up different speakers during testing.

Sofia O. ★★★★★

The custom alarm setup was surprisingly straightforward, and I love that it teaches rhythm and notes while building something practical. The two audio output options give you real flexibility, and it’s genuinely satisfying to hear it trigger correctly every time.

Alexander ★★★★★

I got the two audio outputs working in under an hour, and the custom alarm tune I programmed was surprisingly satisfying. This was a fun, practical build that actually taught me a bit about frequencies while keeping my spare key safe.