The lock of the present invention includes a housing, a fastening element, a stopping element, a first locking mechanism and a second locking mechanism. The fastening element is movable relative to the housing and is selectively located at a securing position and a releasing position; the stopping element has a first state and a second state. The stopping element in the first state restricts the fastening element to be in the securing position while the stopping element in the second state releases the fastening element. The first locking mechanism includes a dynamic element and a sensing device. The dynamic element drives the stopping element to change between the first state and the second state. The sensing device senses a signal and controls the dynamic element.