0.5 MILLISECOND REACTION TIME: Extremely fast .5 millisecond reaction time ensures safe shooting hearing protection; digital sound compression reduces harmful noise from impulse sounds such as gun fire; Noise Reduction Rating (NRR): 21 dB QUICK-CONNECT BLUETOOTH 5.0: Easily sync to music player or mobile device for safe, hands-free communication with others; 2 Mbps data speed is twice as fast as BT 4.2; includes separate volume controls for Bluetooth and external environment amplification SITUATIONAL AWARENESS: 5X sound amplification enhances low level frequencies like range commands, conversation and forest sounds; 2 high-gain, omni-directional microphones allow you to identify source of sound; recessed placement reduces wind noise LOW-PROFILE, COMFORTABLE FIT: Air Flow Control Technology allows for a slim, low profile ear cup to ensure firearm stock clearance; padded, adjustable headband provides a comfortable, custom fit; compact, folding design for convenient storage KIT INCLUDES: Bluetooth earmuff, rechargeable lithium ion battery & micro USB charging cable; automatic shut-off feature after 4 hours increases battery life; replacement ear cushions available