This patented alarm piranha tag is mainly applicable to the field of anti-theft. This tag has an integrated pin and circuit inside to reduce the application process from two steps to one, which helps save labor cost and improve checkout efficiency. In addition, the pinless design helps eliminate the cost of replacing lost or damaged pins. Also avoid body injury caused by pins. It can be 2 alarm or 3 alarm. The alarm will go off if the merchandise is pulled out or the lock is tampered with. In that case, the sound of the alarming can achieve a very good anti-theft effect and reduce the losses of the store.