The TCI Pro Impuse Hearing Protection 10 Count Display instantly reduces dangerous sound levels while allowing speech & audio to be heard. Featuring patent pending filter technology that instantly reduces dangerous sound levels. 33db peak impulse reduction +13db continuous reduction. Fits discreetly in-ear and easily worn under helmets or headsets. Two sizes of medical-grade TPE rubber tips included for long-wear comfort & fit. Aluminum carrying case. No batteries required.