Wearable real-time systems such as health monitors exhibit a need for user feedback capable of communicating a wide range of messages. This paper describes how high-frequency parameters of electrotactile stimulation can be utilized for producing multiple unique message sensations with a limited time period of 0.5s. Two experiments were conducted on willing participants using a custom electrotactile stimulator. Experiment 1 investigated the effectiveness of producing unique sensations by varying electrotactile pulse frequency above 100Hz. Results indicate that even though pulse frequencies above 100Hz produce detectable sensations, discrimination by frequency is not feasible for electrotactile pulse frequencies higher than 100Hz. Experiment 2 investigated the effectiveness of discriminating electrotactile pulse frequencies higher than 100Hz when the signal was modulated at a fixed low frequency (6Hz) “bundles”. Results show that variations in low-frequency bundle duty-cycle produced at least three distinct new sensations that may be utilized to produce uniquely perceived electrotactile sensations.