Safety lock

A safety lock comprising a transponder and a shackle, the shackle being movable from an open state to a locked state, said transponder comprising

• an inlay including
• an IC and antenna coupling elements arranged to couple the IC with an antenna,
• the inlay arranged in or on a base member, the safety lock further comprising
• a housing arranged to envelope the base member, wherein
• the base member comprises a reduction zone the mechanical strength of which is reduced compared to portions of the base member next to said reduction zone,
• the reduction zone being arranged under the IC and/or the antenna coupling elements of the inlay,
• the base member further connected to a first arresting means by an essentially inextensible connection, and wherein
• said shackle comprises a second arresting means, wherein
• in the locked state of the shackle, the first arresting means are arranged to intermesh with the second arresting means such that force striving the shackle from the locked state to the open state is arranged to being transmitted to the reduction zone and to the RFID inlay, and if the safety lock is opened by force, the base member is exposed to force exceeding the mechanical strength of the reduction zone, leading to damaging of the RFID inlay.