Battery-Operated: This Digital Electronic Muff operates on two AAA batteries (included) and has an 80-hour battery life Bundle Includes: Walkers Game Ear Xcel Digital Electronic Muff with Voice Clarity and 4 Listening Modes (Orange), and Walker's Shooting Hearing Protection Case (Black) Noise Reduction Rating: This muff has a noise reduction rating (NRR) of 26 decibels, protecting users' hearing from loud noises while allowing them to hear ambient sounds Four Listening Modes: This electronic muff has a universal, clear voice, hi-frequency boost, and power boost listening modes that allow users to customize their listening experience Bluetooth Connectivity: This digital electronic muff is equipped with Bluetooth technology that allows users to connect it to their smartphones or other Bluetooth-enabled devices and stream audio for up to 26 hours