Abstract: An electric seal includes a wireless tracking facility having a wireless telecommunicating device disposed in a container and having two contacts, a housing engaged in the receptacle, and a lock shaft engageable into the receptacle and lockable to the housing for retaining the receptacle and the housing together, and the lock shaft includes a portion electrically connected to one of the contacts of the wireless telecommunicating device and another portion connected to the other contact of the wireless telecommunicating device for electrically coupling to the contacts of the wireless telecommunicating device together, and the wireless telecommunicating device emits a signal out when the lock shaft is cut or damaged.