You can build your own double-protected money safe by connecting a buzz alarm circuit and a simple dial lock. Store your pocket money or top secrets inside. No spy or burglar could retrieve the contents inside without the key and pin number. Your treasure is under safe protection!
Build and configure a digital lock to create the most secure coin bank ever.
Learn how to wire a circuit and install an alarm buzzer for maximum security.
Challenge friends to bypass the buzzer and crack the lock if they can.
