RAZOR Digital X-TRM from Walker's features innovative Cool Mesh Headband, and Comfort GEL Earpads making prolonged use of hearing protection more comfortable than ever. Ultra low-profile design, and collapsible. Advanced Digital Circuit with lightning fast Active Dynamic Sound Suppression, Hi Gain Omni Directional Mics, and Clear digital sound. Wind noise reduction, Auto shut off 2/4/6 hours, NRR 23. Powered by 2 (AAA) batteries -included.