Abstract: In some example embodiments, there is provided a tag. The tag may include an antenna configured to receive a first radio frequency signal and to reradiate a second radio frequency signal; and an ultrasonic transducer coupled to the antenna, wherein an ultrasound signal received by the ultrasonic transducer causes a variation of at least one property of the ultrasonic transducer, wherein the variation of the at least one property imparts a modulation onto at least a portion of the first radio frequency signal, and wherein the modulated first radio frequency signal is reradiated by the antenna as the second radio frequency signal. Related system, methods, and articles of manufacture are also disclosed.