This small alarm circuit protects your valuables from thefts by engaging the alarm when somebody attempts to pick up your suitcase.It can be operated with the [[wysiwyg_imageupload::]]help of 3V therefore power consumption is also very less.It uses very less components that why it can be easily fit on the suitcase. Due to its small size you can easily carry this small alarm while you are travelling.The circuit is build around IC LM358 which is a low power transducer amplifier. The important component of this circuit is piezo sensor. Piezo sensor converts vibration or pressure into electrical signal. This same piezo element can be found inside the buzzer or you can purchase the same from market. Its working is somewhat similar to capacitors. Piezo element holds the charge when potential applied, until it is mechanically disturbed or some vibration will be there.