a simple door alarm

Step 6: FINAL STEP

Attach all of this to a recycled back.
Then attach the wide cable right down the middle of it. Next, thread some thread down the cable and tie it to the end of the paperclip so that when you pull the other end it rings.
FINALLY... Attach alarm to a wall next to your door... Attach thread to door... Open Door...............

RIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIING!!!!!