The invention relates to a system for information transmission between a write- and/or read installation and several portable devices. According to the invention, the information transmission between a portable device and the write- and/or read installation is effected via two channels. On the one hand a first information transmission takes place capacitively and preferably with the human body as a transmission medium. On the other hand, the information transmission procedure also includes a second or conventional "contactless" transmission, i.e. an inductive transmission or a transmission via electromagnetic waves, for example in the radio frequency-, microwave- or infrared range.