Wireless Hearing protector (Earmuff) connects to bluetooth enabled devices for streaming music and communication SYNC Wireless Earmuffs offer a significant level of hearing protection and uncompromised stereo sound by easily plugging into any portable music device; MP3 or smartphone, but performs as a traditional passive earmuff when an audio device is not plugged in. Bluetooth 4.1 enabled earmuff connects to bluetooth enabled devices for streaming music and communication. You can stay protected by controlling music and placing/ending calls without removing mobile device from your pocket. Black/Red body. 25 NRR.