Elvex Wireless Headset Earmuffs allow wireless sync-to-phone communication with the touch of a button. Protect hearing in noisy environments with a 22 NRRdB and still allow you to communicate with coworkers. Allows contact with other compatible devices up to 10' away. Input jack for your portable music player. Comfortable, foam-padded PVC headband, plus soft earcups. 4-hr. auto shut-off. Built-in USB charger port. Run on and include (2) AA alkaline batteries.