Updated with Bluetooth 5.0 technology and an even faster reaction time of .5 milliseconds, these Howard Leight Impact Sport Bluetooth Electronic Earmuffs allow active listening on a hunt or at the range. Amplification automatically stops with loud sounds, like a firearm discharge, and digital sound compression kicks in within milliseconds to protect your hearing. Howard Leight Impact Sport earmuffs offer a noise reduction rating of 21dB. Easily sync the electronic earmuffs to a music player or mobile device for safe, hands-free communication. The latest Bluetooth 5.0 technology offers 2 Mbps data speed twice as fast as the previous generation. Use separate volume controls for Bluetooth and external environment amplification to customize your listening preferences. Sound amplification enhances low-level frequencies like conversation and forest sounds up to 5 times that of normal hearing. Dual high-gain, omni-directional microphones allow you to identify the source of sound, while recessed placement reduces wind noise. Automatic shut-off feature after 4 hours increases battery life. Air Flow Control Technology, and adjustable headband increase comfort. Slim, low-profile ear cups ensure firearm stock clearance. Compact, folding design offers convenient storage. Kit includes earmuffs, rechargeable lithium-ion battery, and micro USB charging cable. Wireless Bluetooth 5.0 technology Ultra-fast .5 millisecond reaction time 21dB NRR Dual high-gain, omni-directional microphones Up to 5 times low-level sound amplification Air Flow Control Technology Compact, folding design