Advanced Digital Circuit Bluetooth connectivity Variable Dynamic Sound Suppression Hi-gain omnidirectional Microphones Four listening modes Auto shut off Ergonomic headband design with controls Fewer holes in the muff cups to improve NRR Low battery warning Powered by 2 (AAA) batteries (included) Bundle Includes: XCEL 500BT Digital Electronic Muff with Voice Clarity and Bluetooth and Shooting Hearing Protection Case Four Different Listening Modes: The XCEL 500BT allows the wearer to select between four different listening modes: Universal (for sound amplification), Speech Clarity (for discriminating voices and enhancing verbal communication in a noisy environment), High Frequency (tuned specifically to hear steel target impact at long distances), and Power Boost (amplifies sound across the range of volume). All the modes are accessible via the soft-touch button control panel located on the headband Improved Hearing Protection: The XCEL 500BT’s Sound-Activated Compression and variable Dynamic Sound Suppression automatically adjusts compression time according to noise level intensity and duration instead of using conventional fixed-time compression. The result is improved hearing protection regardless of the sound environment Convenient Operational Modes: Voice prompts for the entire menu allow the user to select the available operational modes. This makes navigation very simple and removes the guesswork as to which mode the unit is in. The XCEL 500BT Earmuff also comes with programmable auto shut-off, so forgetting to turn the muffs off and accidentally running down batteries is a thing of the past Bluetooth Connectivity: Bluetooth compatibility is another valuable feature. By pairing this earmuff to a mobile device, calls and notifications connect through the muffs. Messages and conversations can be heard clearly even in noisy environments.