Peltor Sport Tactical Electronic Hearing Protector earmuffs have low-profile cups for rifle/shotgun use to suppress gunshot noise and amplify low sounds using proprietary 3M SMART technologies, and have an auto shut-off feature. Gunshot Recognition and Suppression Technology optimizes noise protection based on the firearm being used and the environment in which it's being used. Clear Voice Tracking Technology seeks voice within background noise to improve speech intelligibility and situational awareness. Engineered for optimal fit and comfort, the vented, adjustable headband improves comfort when worn with hats, low-profile cups have cut-outs for use with long guns, intuitive buttons and voice guidance let you operate without removing headset. These earmuffs have durable, recessed microphones designed to reduce wind and fan noise. The Sport Tactical 500 has a targeted NRR of 26 dBA for passive sound protection. This model features Bluetooth wireless technology to seamlessly sync to mobile devices enabling you to make and receive phone calls through the headset.