Universal Mode: The universal mode allows sound amplification Power Boost Mode: The Power Boost mode amplifies sound across the range of volume High Frequency Mode: This mode is tuned specifically to hear steel target impact at long distances Speech Clarity Mode: This discriminates voices and enhances verbal communication in a noisy environment Bluetooth Connectivity: Pair the Walker's XCEL 500BT OD Green Electronic Muffs to a mobile device to receive calls and notifications