Wireless detonators, and corresponding wireless detonator systems present opportunities for blasting arrangements that avoid the need for physical wire connections between the blasting components. The insert includes a bundle of coated wires that are joined together and have a predefined length. A location module determines a target location for an offer based on a user’s financial transaction data. A second writing member are arranged on a second face of the film substrate to supply signals from a second electrode driver to the second electrode group in the writing electrodes.