3M 90542-3DC Work Tunes Wireless Hearing Protector with Bluetooth Technology. It is a black/silver earmuff that provides entertainment and hearing protection in 1 easy to use and comfortable earmuff. It streams music from mobile phones, tablets, iPods or other Bluetooth enabled devices. It has a noise reduction rate of 24 dB and a radio band type of AM, FM Digital. The battery type is AA Alkaline.