TRACKR Blu Earmuffs offer advanced sound enhancement hearing protection and Bluetooth audio- all inside of a compact slimline Earmuff for all your ear pro needs. - 27 dB Single Number Rating [SNR] - Sound Enhancement Hearing Protection & 5.0 Bluetooth At the Same Time - Turn your sound enhancement up or down to your exact desired level then enjoy clear hearing for any environment you want. Then notice while you are hearing everything you want the AXIL technology will automatically compress damaging loud sounds to give you the hearing protection you need- all at the same time without interrupting your clear hearing. You can also enjoy 5.0 Bluetooth for audio & hands-free communication. - Smooth clear hearing enhancement sound quality - 5.0 Bluetooth Audio - Autoblocker Technology compresses loud sounds over 85 dB - 27 dB SNR- Hearing Protection - Reduces Wind Noise - Sweat & Water Resistant - Sound Activated Compression 0.02 second reaction time - Compact Design gives you comfort in a small sized ear muff - Comfortable headband with metal wire frame - Dual purpose technology lets you enhance sounds and protect your hearing at the same time and enjoy 5.0 Bluetooth audio altogether. - Single Volume Control - Audio Input Jack - External Battery Door - 2 'AAA' Batteries Included