鎖箱

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.

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.

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.