One example discloses a multi-radio device, including: a controller configured to be coupled to a first radio that is configured to transmit a first signal, and a second radio that is configured to transmit a second signal; wherein the controller includes a detection element configured to detect a third signal generated in response to simultaneous transmission of the first and second signals; wherein the controller includes a decision element configured to modulate one or more information packets in the first and second signals in response to the third signal.