various components of the alarm circuitry these include at least an electronic circuit board 5 a buzzer 6 a battery 4 a magnetic switch 3 and a magnet 13 this volume is depicted like a rectangular prism in the appended drawings conveniently the volume is closed by a cover 9 in order to protect the electronic circuitry contained therein the magnetic switch 3 may be a reed switch located suitably for sensing the motion of the metallic rod 2 during a lock snapping attack as the metallic rod 2 is secured to the tip portion 8 of the second cylinder half 22 the rod slides initially out of the first cylinder half 21 when the tip portion 8 breaks apart as the position of the rod 2 between the switch 3 and magnet 13 changes and eventually the rod completely slides out of the interspace this is sensed by the switch and an alarm is triggered an audible signal is then released by a buzzer 6 in order to increase the intensity of the sound generated by the buzzer 6 an echo surface 12 is formed on the cover 9 the echo surface is concave arc form such that the sound generated by the buzzer 6 is directed towards to the second cylinder half 22 whose tip portion 8 is detached additionally a sonic outlet channel 11 is formed on the second cylinder half 22 for conveying the sound waves from the buzzer to the outlet of the second cylinder half the person making the lock snapping attack hears the sound more.